By J. Fasim. Central Pennsylvania College. 2018.
The trigeminal nerve also has another important function: the cutaneous sensation of the face and anterior scalp buy differin 15gr free shipping skin care brand crossword. It is discount differin 15 gr free shipping skin care jakarta timur, except for a small area of skin in the external ear, the only nerve concerned with this. The motor components of swal- lowing are mainly the responsibility of the vagus (X) and glossophar- yngeal (IX) nerves, with the hypoglossal (XII) nerve also initially involved. The vagus both innervates the muscles of swallowing, and 42 Individual cranial nerves and functional considerations senses, albeit unconsciously after the initial stages, its progress. It is also involved in phonation and speech which are related to swal- lowing in that many of the muscles and nerves are the same. These processes are aided by the glossopharyngeal nerve which, with the vagus, carries sensory information to the brain and participates in the perception of taste and the control of salivary secretions. The accessory nerve (XI) is an accessory to the vagus and so it too should be included in this group. After this, the loose ends of taste sensa- tion and autonomic function may conveniently be tied up. The cranial end of the developing embryo is dominated by five pairs of structures which arise on either side of the primitive pharynx: these are the branchial (or pharyngeal) arches. Mandibular and facial movements and sensations are the functions of the first and second arches, of which the nerves are, respectively, the trigem- inal and facial. Pharyngeal movements and sensations involved in swallowing are the concern of the third, fourth and sixth arches, and the nerves of these are the glossopharyngeal (third arch) and the vagus (fourth and sixth arches) (see Table 3. This leaves the other main function of the head: the awareness of our surroundings. Our sense of smell is to a large extent linked with taste and basic physiological and psychological drives: it is therefore studied in connection with taste. Finally, vision, eye movements, balance and hearing are all interrelated and are con- sidered together. Thus, the cranial nerves are considered in the following order: 1 the trigeminal, facial and hypoglossal nerves (V, VII, XII); 2 the vagus, glossopharyngeal and accessory nerves (X, IX, XI); 3 autonomic function, taste sensation and olfaction (I); 4 vision and eye movements (II, III, IV, VI), and vestibular func- tion and hearing (VIII). Survey of cranial nerves and introduction to Parts II–V 43 Note In Parts II–V the anatomical course of each nerve is usually described from its brain stem attachment outwards. However, each functional group of fibres is described according to the direction taken by the nerve impulse, motor fibres being described from central to periph- eral, and sensory fibres from peripheral to central. PART II TRIGEMINAL, FACIAL AND HYPOGLOSSAL NERVES Chapter 6 CUTANEOUS SENSATION AND CHEWING 6. In this position it makes sense that the dorsal aspect of the neck and head should be supplied by dorsal rami of spinal nerves, and the ventral aspect of the neck and head (under the chin) by ventral rami. This leaves the entire anterior aspect of the face, which, in a quadruped, goes first into new environments, with a cutaneous nerve all to itself – the trigem- inal. All you have to do is remember that because we are upright bipeds, the relative positions of the head and trunk have changed as compared with the quadruped. Sensory information from the face and scalp is carried back to the trigeminal sensory nuclei (Section 4. Examples of these central connections can be illustrated by what happens when we wash our face in the morning. Connections from the trigeminal nuclei include those to: 1 the sensory cortex and other cortical centres for perception: we know what we are doing; 48 Trigeminal, facial and hypoglossal nerves 2 the limbic system: a habit like this pleases us because our mothers conditioned us to do it when we were children (quite wrongly as it happens since soap is bad for the skin); 3 the reticular formation: it wakes us up; 4 the hypothalamus: vasoconstriction or vasodilatation, according to the temperature of the water. The second and third divisions of the trigeminal innervate the roof and floor of the mouth, so it will not surprise you to learn that they are involved not only with cutaneous sensation but also with sensation in the oral cavity and with movements of the mandible. In a baby before weaning, the buccinator (VII) and the tongue (XII) are the principal muscles of sustenance producing the necessary sucking forces. Damage to VII in infants, for example birth injuries, will impair feeding (see Facial nerve injury in babies in Section 11. This proprioceptive information is carried to the mesencephalic nucleus of the trigem- inal nerve (Section 4. The consistency of the food is sensed by branches of the mandibu- lar nerve and when this is judged satisfactory, the bolus is propelled backwards on to the posterior (glossopharyngeal) portion of the tongue and swallowing begins. Once the bolus has passed the pos- terior portion of the tongue, the process is irreversible or, at any rate, reversible only with a great deal of coughing and spluttering. These impulses originate in the superior and inferior salivatory nuclei and pass to the glands through branches of the facial and glossopharyngeal nerves, and, peripherally, the trigeminal.
Note: trochlear nerve is so called because superior oblique (which it supplies) is arranged as a pulley (Latin: trochlea – pulley) purchase differin 15gr amex skin care questionnaire. Ascends to pass through cavernous sinus differin 15gr visa skin care natural remedies, on internal carotid artery, superior orbital fissure (within common tendinous ring). Motor fibres innervating them, therefore, are somatic motor fibres and nuclei are somatic motor nuclei. Parasympathetic fibres in III: Edinger–Westphal nucleus Edinger–Westphal nucleus on rostral margin of III nucleus. Receives fibres from superior colliculi and pretectal nuclei (ocular reflexes, The oculomotor (III), trochlear (IV) and abducens (VI) nerves 125 Chapter 22). Postganglionic axons in short ciliary nerves to constrictor pupillae and ciliary muscles. Benedikt’s syn- drome involves the nerve as it passes through the red nucleus: oculomotor paralysis with contralateral extrapyramidal dyskine- sia. In Weber’s syndrome the lesion is more ventral, also involving motor fibres in the cerebral peduncles: oculomotor paralysis is associated with contralateral UMNLs. Complete section of the oculomotor nerve would lead to ptosis (partial paralysis of LPS), lateral squint (unopposed action of superior oblique and lateral rectus), pupillary dilatation (unopposed sympathetic activity), loss of accommodation and light reflexes. This causes medial squint (somatic fibres) and ptosis (sympathetic fibres to LPS). It may be involved in fractures of the base of the skull or in intracranial disease. Section of the nerve would result in con- vergent squint (the eye abductor being paralyzed). Because of this long intracranial course it is often the first cra- nial nerve to be affected by intracranial disease. So, if you could only test one cranial nerve as part of a neurological investiga- tion, this would be the one! This compresses the midbrain which passes through the tentorial notch and the nearby oculomotor nerve. The result is pupillary dilatation (unopposed sympathetic action as the parasympa- thetic fibres in III are affected), at first unilateral and then bilat- eral. Because this may cause an erroneous diagnosis to be made, it is known as a false localizing sign. It affects all the nerves that pass through or in the wall of the sinus (III, IV,Va,VI). The abducens nerve is usually affected first because it passes through the sinus, causing a paralysis of lateral rectus and a resultant medial squint. Involvement of the ophthalmic nerve may cause severe pain, and the condition may result ultimately in papilloedema and visual loss. Since the advent of antibiotic therapy, this con- dition is much less often encountered than formerly. Chapter 22 VISUAL REFLEXES: THE CONTROL OF EYE MOVEMENTS; CLINICAL TESTING OF II, III, IV AND VI 22. This reflex is elicited on patients, conscious or unconscious, and it is, amongst other things, a crude test of brain stem function. Pass down left hand side, along bottom and up right hand side Postganglionic fibres Shine light in ciliary nerves to in eye constrictor pupillae Ciliary ganglion Preganglionic fibres in III Impulses pass along optic nerve, chiasma, tract Before reaching lateral geniculate Edinger–Westphal body, some fibres nucleus branch to midbrain Midbrain pretectal nucleus Fig. Pupillary light reflex Accommodation reflex Retina Retina Optic nerve Optic nerve Optic chiasma Optic chiasma Optic tract, then branching Optic tract, lateral geniculate fibres to: body, optic radiation, visual cortex, association fibres to frontal lobes, fibres descend through anterior limb of internal capsule to: Midbrain: pretectal nuclei Midbrain: superior colliculus Midbrain: Edinger–Westphal Midbrain: Edinger–Westphal nucleus then ipsi- and nucleus then ipsi- and contralateral to: contralateral to: Oculomotor nerve III Oculomotor nerve III Ciliary ganglion (synapse) Ciliary ganglion (synapse) Constrictor pupillae muscle Muscles of iris and ciliary body for miosis commissural connections, when light is shone into one eye, both pupils respond: the reflex is consensual. Fixed dilated pupils are pupils which do not respond to light: they are a likely indi- cator of brain death. These changes are 130 Vision, eye movements, hearing and balance equivalent to those made by photographers in stop adjustment and lens extension on a camera. You will realize that in the accommoda- tion reflex perception is involved, unlike the pupillary light reflex, and thus the cortex is involved. There is also a degree of voluntary control since you can decide to focus on an object. A comparison of the pathways for the accom- modation reflex, which functions normally, and the pupillary light reflex, which does not, indicates that the lesion could be in: (a) the fibres that pass from the optic tract to the midbrain, (b) the pretec- tal nuclei or (c) that part of the Edinger–Westphal nucleus which deals with fibres from the pretectal nuclei. The frontal eye fields mediate voluntary eye movements and are responsible for saccadic movements by which means we search the visual fields for an object on which to fix. Saccades are so rapid that individual visual images are imperceptible until fixation has ensued.
In addition buy 15 gr differin with mastercard skin care di jakarta, patients’ daily sched- ules should be explored in order to suggest how physical activity can be incor- porated into their daily routine order 15 gr differin with visa acne 6 months postpartum, e. In addition, the use of behaviour change interventions for structured exercise and other health behaviour is recommended in the UK (SIGN, 2002). BEHAVIOUR CHANGE MODELS Several behaviour change models have been used to understand exercise behaviour in non-clinical and clinical populations. In addition, these models provide a theoretical framework for developing practical and effective inter- ventions to improve physical activity participation. Although many other models of behaviour change exist, the Transtheoretical Model and Relapse Prevention Model, which are brieﬂy described here, have been extensively studied in exercise settings and provide the basis for many physical activity interventions, including exercise consultation and physical activity counselling (Biddle and Mutrie, 2001). Transtheoretical Model The Transtheoretical Model (TTM) was originally developed to understand behaviour change related to smoking cessation (Prochaska and DiClemente, 1983), but has since been applied to exercise behaviour (Prochaska and Marcus, 1994). Interventions based on the TTM have been effective in 198 Exercise Leadership in Cardiac Rehabilitation promoting and maintaining physical activity (Marcus, et al. The model proposes that individuals attempting to change their physical activity behaviour progress through ﬁve stages (Marcus and Simkin, 1994). The stages differ according to an individ- ual’s intention and behaviour and have been labelled as follows: • Precontemplation (inactive and no intention to change); • Contemplation (inactive, but intending to change in the next six months); • Preparation (engaging in some activity, but not regularly); • Action (regularly physically active, but only began in the past six months); • Maintenance (regularly active for more than six months). Movement through these stages often occurs in a cyclic pattern because many individuals relapse to an earlier stage when attempting behaviour change. Three components of the TTM are hypothesised to mediate the behaviour change process: the decisional balance, self-efﬁcacy and the processes of change. Decisional balance involves a comparison of the perceived pros and cons of engaging in behaviour. Studies have demonstrated a signiﬁcant rela- tionship between exercise adherence and perceived pros and cons of exercise in patients with CHD (Tirrell and Hart, 1980; Robertson and Keller, 1992; Hellman, 1997). A recent meta-analysis (Marshall and Biddle, 2001) found that the decisional balance is related to the stage of exercise behaviour change as depicted in Figure 8. The pros of exercise increase with advancing stage of change, with the largest increase evident from the precontemplation to the contemplation stage. The perceived cons of change decrease across the stages, with the most pronounced decline occurring from precontemplation to contemplation. Therefore, it seems that increasing perception of the pros and decreasing per- ception of the cons of exercise are important to increase physical activity. Similarly, Hellman (1997) reported a decline in the perceived costs of exercise and an increase in the perceived beneﬁts of exercise, with advancing stage of change in a group of patients who had previously attended in-patient CR. Self-efﬁcacy was integrated into the TTM from Bandura’s Self-Efﬁcacy Theory (Bandura, 1977), and is deﬁned as an individual’s conﬁdence in his or her ability to perform a speciﬁc behaviour. Self-efﬁcacy is an important deter- minant of exercise compliance in cardiac rehabilitation settings (Robertson and Keller, 1992; Vidmar and Rubinson, 1994). Findings from the meta- analysis (Marshall and Biddle, 2001) demonstrated a signiﬁcant relationship between exercise self-efﬁcacy and stage of change, as illustrated in Figure 8. The graph shows that conﬁdence to be active increases with each forward movement in stage of change. Individuals in the precontemplation stage demonstrate the lowest self-efﬁcacy, whereas those in maintenance have the highest self-efﬁcacy. Furthermore, the relationship between exercise self- efﬁcacy and stage of change is non-linear, and self-efﬁcacy seems to be Maintaining Physical Activity 199 Figure 8. Relationship between the stages of change and decisional balance, self- efﬁcacy and processes of change. Processes of Exercise Behaviour Change Process of Change Deﬁnition (adapted from Marcus, et al. Similarly, Hellman (1997) reported that exercise self-efﬁcacy is signiﬁcantly related to stage of exercise behaviour change in CR participants. The processes of change are strategies and techniques that individuals use when changing their exercise behaviour (Marcus, et al.
Similar location of SHT and trigeminohypothalamic (THT) neurons discount differin 15 gr with mastercard acne images, displaying SP receptor-immunoreactivity was reported by Li et al cheap differin 15gr amex acne nose. SHT in the cat has the same cells of origin as in the rat, but the projection appears to be smaller (Katter et al. The SHT axons terminate in most of the hypothalamic divisions: the lateral hypothalamus, posterior, dorsal, and periventricular areas, the dorsomedial, paraventricular, and suprachiasmatic nuclei, and the lateral and medial preoptic areas (Cliffer et al. In monkeys, the axons pass through the thalamus and then enter the hy- pothalamus (Zhang X et al. The latter authors established that the SHT axons collateralize signiﬁcantly in the brainstem, innervating numerous RF nuclei, nucl. After decussating in the hypothalamus, the axons descend in the ipsilateral Po, midbrain, pons, or even rostral medulla. Such axons may provide nociceptive information to a va- riety of nuclei throughout the diencephalon and brainstem bilaterally. Their axons cross the midline and ascend until the level of supraoptic decussations in the lateral hypothalamus. More than a half of the axons recross the midline to reach the ipsilateral hypothalamus. The hypothalamic areas that receive trigeminal input are the lateral, perifornical, dorsomedial, suprachiasmatic, and supraoptic nuclei. The THT axons collateralize profusely: to the superior colliculus, substantia nigra, red nucleus, anterior pretectal nucleus, striatum, globus pallidus, and substantia innominata. Following the observation of Burstein and Giesler (1989) that the SC projects directly to the telencephalon, i. The retrograde tracing experiments of Burstein and Potrebic (1993) indicated that the projection to the amygdala in the rat arises through the entire length of the SC. The number of spinoamygdaloid neurons is modest, and these cells are located bilaterally (mainly contralaterally) in the lateral reticulated area of the deep DH and around the central canal. These authors veriﬁed the projection to the orbital cortex but also pointed out that the number of spinocortical neurons is quite small. They estimated that in both species the total number of terminals seen in the striatal and limbic areas was 50%–80% of the number seen within the thalamus. Presently, the laterocapsular part of the central amygdala is deﬁned as the nociceptive amygdala because of its high content of nociceptive neurons (Bourgeais et al. Giuffrida and Rustioni (1992) counted and measured thousands of retrogradely labeled SG neurons in rats that received a tracer in the DCN. Electrophysiological studies ﬁrst addressed the role of the dorsal columns in mediating visceral pain (Amassian 1951; Rigamonti and Hancock 1978). Willis and his colleagues published a series of papers that demonstrate the profound involvement of the DCN in the transmission of visceral pain (Al-Chaer et al. The nociceptive inputs reach the DCN via two routes: (a) monosynaptic input from PA cells in the SG and (b) the pathway consisting of two neurons: a PA neuron and a neuron in the SC. The classic monosynaptic nociceptive input was described repeatedly (Patter- son et al. More important is the second route: via the so-called postsynaptic ﬁbers trav- eling in the dorsal column. By this bisynaptic pathway, the central process of the PA neuron terminates upon a second-order projection neuron, located in the gray matter of the SC. The axons of these neurons—the postsynaptic ﬁbers—reach the DCN (Rustioni 1973, 1974; Rustioni and Kaufman 1977; Cliffer and Giesler 1989; Cliffer and Willis 1994; Hirschberg et al. The found that the ﬁbers originate mainly from ipsilateral DH, particularly from its medial part at upper cervical levels and from a band of gray matter throughout the SC, largely corresponding to lamina IV and adjacent lami- nae. Large neurons along the lateral border of the ventral horn at lumbar levels may also contribute nonprimary afferents to the ipsilateral DCN. In the cat (Rustioni and Kaufman 1977), the cells of origin are numerous in the upper cervical, brachial, and lumbosacral SC, but are sparse in the thoracic segments. In the brachial and lumbosacral cord, the neurons of origin are mainly localized in lamina IV and more ventrally. In the lumbar segments, the cells of origin are located within a narrow band extending across the ipsilateral DH, subjacent to substantia gelatinosa.