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Task 4. Accessory nerve (XI-th pair) investigation

Accessory nerve is a motor one, it innerves sternocleidomastoid and trapezius muscles (head turn in an opposite side and shrugging one’s shoulders). The investigated person turns his head towards and up and restrains in such location. The investigator tries to oppose to this. For sternocleidomastoid muscle force you can tell according to resistance degree. Trapezius muscle is investigated by raising and fixating in such a situation. Shoulder girdle is lowered at paralysis.

Task 5. Hypoglossal nerve (XII-th pair) investigation

This nerve innerves the tongue. One should perform the tongue investigation. It’s necessary to put it forward behind the teeth line. At one-sided nerve injury – atrophy of the same tongue half, thinness, foldedness of mucosa, fibrillations. The tongue is sticked out in a sick side. At injury of two nerves – the tongue is almost immovable, the speech is disturbed as well as pushing of chilus in mouth.

The injury of V, IX, X, XIIth pairs leads to the disorders of swallowing (dysphagy), sounding voice loss (aphony), speech nasal shade (nasolaly), anomaly of correct order of articulate sounds prononciation (dysarthry).

5. Literature recommended:

1. Lecture course.

2. Mistchenko V.P., Tkachenko E.V. Methodical instructions for medical students (short lecture course).-Poltava, 2005.-P. 15-16.

3. Mistchenko V.P., Tkachenko E.V. Methodical instructions on Normal Physiology on practical classes for dental and medical students.-Poltava, 2005.-P. 47-48.

4. Ganong W.F. Review of Medical Physiology.-21st ed.-2003.-Section II.

5. Guyton A.C. Textbook of Medical Physiology.-NY, 1992.-P. 625-626.

6. Materials for self- control:

А. Control questions:

  1. Medulla oblongata centers.

  2. Medulla oblongata reflectory activity.

  3. Posterior brain vegetative reflexes.

  4. Posterior brain conductory function.

  5. Reflexes the mostly often determined in dentistry (for dentists).

Lesson 14 Midbrain physiology. Midbrain role investigation in motor and sensor functions regulation

1. The topic studied actuality.

Masticatory and mimic muscles function can be changed at this brain part injury. Particularly, black substance is responsible for co-ordination of movements connected with food taking.

Dentists can get in touch with patients suffering from oral cavity motor and sensor functions disorders due to midbrain pathology.

Study aims:

To know: midbrain morphological-functional peculiarities; midbrain reflectory activity; brain stem sensory function; stem reticular formation structure, connections and role; midbrain cranial-cerebral nerves role; midbrain vegetative reflexes.

To be able to: explain mechanisms explaining muscular tone disorders in “mesencephalic” animals.

  1. Pre-auditory self-work materials.

3.1.Basic knowledge, skills, experiences, necessary for study the topic:

Histology

Midbrain histological structure

Recognize midbrain preparation

Anatomy

Midbrain anatomical structure and conductive ways, cranial-cerebral nerves (IV, VI pairs) location

Draw midbrain ascending and descending conductive ways, cranial-cerebral nerves nuclei location

Biochemistry

Dophamine oigin and role in human organism

Neurology

Midbrain external and internal structure, conductive ways, cranial-cerebral nerves (IV, VI) morphology and functions (norm and pathology)

Draw midbrain conductive ways, cranial-cerebral nerves nuclei location.

Dentistry

Mentioned cranial-cerebral nerves anatomy, physiology, midbrain role in mastication, swallowing and their alternation with respiration during food taking

Analize posterior brain and cranial-cerebral nerves pathology signs.

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