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Pons cerebri

This forms a bridge between medulla and midbrain. The functions of pons are:

1. The axons of pontine nuclei join to form the middle cerebellar peduncle or the brachium pontis, Pons forms the pathway connecting the cerebellum with the cerebral cortex.

2. The pyramidal tracts pass through the pons.

3. The medial lemniscus is joined by the fibers of 10th, 9th, 7th and 5th cranial nerves in pons.

4. The nuclei of 8th, 7th, 6th and 5th cranial nerves are located in pons.

5. It contains the pneumotaxic and apneustic centers for regulation of respiration.

6. Pons also contains the vestibular nuclei, which are already mentioned in medulla oblongata.

4. Materials for auditory self-work.

4.1.List of study practical tasks necessary to perform at the practical class.

Materials and methods: neurologic hammer, paper strip.

Investigation object: human being.

Task 1. Trigeminal nerve (V-th pair investigation)

  1. Corneal reflex – the investigated person looks up and towards. The investigator touches with thin paper strip to the inferior-exterior eyeside without touching the eyelashes. The reflex arc - orbital nerve (Vth pair ramus), pons, facial nerve. Decreasing or lost of corneal reflex is found out at trigeminal nerve, facial nerve, pons injuries, at shock, in course of narcosis.

  2. Conjunctival reflex – is caused by touching to conjunctive. Answer reaction- eyelid close. Reflectory arc – see like at corneal reflex.

  3. Superciliar reflex - is caused by hummer shock at superciliar arc limb. Answer reaction - eyelid closure. Reflex arc – orbital nerve, pons, facial nerve.

  4. Mandibular reflex - the investigated person slightly opens his mouth. Masticatory muscles contraction is caused by hammer shock down on chip from one than from another side. Answer reaction – mandible lifting. This reflex can be absent under normal conditions.

Task 2. Facial nerve (VII-th pair) investigation

For this gaim it’s necessary to perform face examination: difficulties at mastication, muscular volume diminishing, frontal and nasolabial plicas asymmetry, whether the face become distorted (mouth angle). They ask to perform masticatory movements putting their fingers to the facial muscles. The investigator asks the investigated person to wrinkle, to frown (knit) the eyebrows, to close eyes, to billow cheeks, to show teeth, to stretch lips.

а) Orbicular muscle force determining - the investigated person is asked to close his eyes strongly. The investigator tries to raise eyelid superior determining resistance force at this. To make the conclusion.

Task 3. Glossopharyngeal nerve (IX-th pair) investigation

The investigation must be begun from the determining of the investigated person voice timbre and sounding. At disorder of innervation of velum palatinum (if it doesn’t close nasopharynx cavity completely) the voice is nasal. At vocal chords injury one can aphony and wheezing. Then the investigator must examine soft palate. The investigated person is asked to tell “A” (at one-sided injury at given side soft palate doesn’t tighten).

Palatine and pharyngeal reflexes – with the paper rolling up into long strip to touch the soft palate and pharynx posterior wall mucosa. Answer reaction is swallowing and vomiting. Reflexes are realized by means of glossopharyngeal and vagus nerves. The decreasing or lost of these reflexes can be both at healthy people and at injury of IX-th and X-th pairs of cranial nerves or their nuclei in medulla oblongata (so-called bulbar syndrom).

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