Question

Anatomy and Physiology lab 568 Chapter Twenty-Four The Brain and Cranial Nerves Exercise 24.9 Teating Specific Punetions of the Crenial Nerves 13. Match the disorder listed in column A with the cranial nerve associated with that disorder Isted in column B. Some answers may be used more than once. Column A 1 blindness 2 comeal reflex is absent (2 answers 3. difficuity turning the eye inferlor and lateral 4 inability to lateraly rotate the eye 5. Inability to maintain balance and equilbrium Column a abducens b accessory (spinal accessory) C facial 6. inability to pucker the lip 7 Inability to smeil g olfactory 8. Inability to taste bitter (sensed by posterior taste buds of the tonguel 9 pupilary refexes are absent 2 answers) 10 soft palate droops on one side (2 answers) t. tongue deviates to one side when it is stuck out of the mouth 12. weakness in elevation of the scapuls L trigemina J trochlear k. vogus 14. Three of the 12 cranial nerves carry somatic motor ibers to extrinsic muscles of the eye Complete the table by listing the nerves that carry somatic motor fibers to the extrinsic eye muscles, and then name the muscle/s) Innervated by each merve 15. Several cranial nerves Innervate structures of the tongue. Complete the table by listing the nerves that innervate structures of the tongue, and then list the functions of each nerve. by the Nerve of the 12 cranial nerves carry parasympathetic motor output output, and then give the parasympethetic function's) of each nerve. Complete the table by listing the nerves that carry parasympathetic motor 16. Four ie Motor Fanetion's) of the Nerve Nerve

Answer 1

13. Blindness - optic nerve

Corneal reflex is absent - trigeminal and facial

Difficulty moving the eye inferior and lateral - trochlear

Inability to laterally rotate the eye - abducens

Inability to maintain balance and equilibrium - vestibulocochlear

Inability to pucker the lips - facial

Inability to smell - olfactory

Inability to taste better - glossopharyngeal

Pupillary reflexes are absent - optic and oculomotor

Soft palate drops on one side - vagus and glossopharyngeal

Tongue deviates to one side when it is stuck out of the

mouth - hypoglossal

Weakness in elevation of the scapula - acessory ( spinal accessory)

14. Cranial nerve and the extrinsic eye muscles :-

1. Oculomotor nerve - innervates the medial ,inferior , superior recti , the inferior oblique , levator palpebrae muscles

2. Trochlear nerve - innervates the superior oblique muscle.

3. Abducens nerve - innervates the lateral rectus muscle .

All these nerves carry somatic nerve fibers to the extrinsic eye muscles .

15. Cranial nerves that innervates the structure of tongue are:-

- Hypoglossal nerve innervates the intrinsic and extrinsic muscles of tongue except the palatoglossal .

- Vagus nerve innervates the palatoglossal ,gag reflex

- Glossopharyngeal nerve for swallowing ,gaga reflex ,speech and taste

16. Cranial nerves that carry parasympathetic motor output and their function are:-

- Oculomotor nerve controls the muscles of eye ,it's signal originates in the brain cells in brainstorm and travels down long thin extensions called nerve fibre

- Facial nerve - it causes parasympathetic innervation to the mucous glands of oral cavity ,nose , pharynx and lacrimal gland

- Glossopharyngeal nerve - it supplies parasympathetic fibers to the parotid gland via the otic ganglion

- Vagus nerve - parasympathetic innervation of heart partially is done by vagus nerve .