The trochlear nerve is the fourth paired cranial nerve. It is the smallest cranial nerve (by number of axons), yet has the longest intracranial course.
Which is the longest cranial nerve?
The vagus nerve (cranial nerve [CN] X) is the longest cranial nerve in the body, containing both motor and sensory functions in both the afferent and efferent regards.
Is Abducens smallest cranial nerve?
The trochlear nerve (CN4) is the smallest cranial nerve yet has the longest pathway. It is susceptible during closed head injury. The abducens nerve (CN6) exits the ventral pons and ascends the clivus to reach the cavernous sinus.
Which nerve is the longest?
The sciatic nerve is the largest nerve in your body. It begins in your lower back and travels all the way down to the heel of your foot.
What is the fattest cranial nerve?
The trigeminal nerve is the largest cranial nerve and is the great sensory nerve of the head and face, and the motor nerve of the muscles of mastication.
Which side of the neck is the vagus nerve on?
On the right side, it arises from the trunk of the vagus as it lies beside the trachea. On the left side, it originates from the recurrent laryngeal nerve only.
Which is the thickest cranial nerve?
The largest cranial nerve is trigeminal nerve. The smallest cranial nerve is abducens nerve. The thinnest cranial nerve is trochlear nerve.
What is the smallest nerve in the body?
The trochlear nerve is unique among the cranial nerves in several respects: It is the smallest nerve in terms of the number of axons it contains. It has the greatest intracranial length. It is the only cranial nerve that exits from the dorsal (rear) aspect of the brainstem.
What is the 12th cranial nerve?
The Hypoglossal Nerve is the 12th Cranial Nerve (Cranial Nerve XII). It is mainly an efferent nerve for the tongue musculature. The nerve originates from the medulla and travels caudally and dorsally to the tongue.
How do you test for cranial nerve 6?
3rd, 4th, and 6th Cranial nerves
Extraocular movements controlled by these nerves are tested by asking the patient to follow a moving target (eg, examiner’s finger, penlight) to all 4 quadrants (including across the midline) and toward the tip of the nose; this test can detect nystagmus and palsies of ocular muscles.
Is sciatic nerve on right or left?
The five nerve roots come together to form a right and left sciatic nerve. On each side of your body, one sciatic nerve runs through your hips, buttocks and down a leg, ending just below the knee. The sciatic nerve then branches into other nerves, which continue down your leg and into your foot and toes.
Do nerves carry blood?
The main difference between nerve and vein is that nerve is an axon bundle of neurons in the peripheral nervous system, which carries nerve impulses whereas veins are blood vessels, which return deoxygenated blood towards the heart. Both nerves and veins vary in size.
Which body part has the most nerves?
The clitoris has 8,000 nerve endings (and nine other things we learned from a new artwork)
- A clitoris is like an iceberg. …
- There are more than 8,000 nerve endings in the tip of the clitoris alone. …
- They can swell as much as 300 per cent when engorged. …
- G-spot and penetrative orgasms are clitoral.
23 янв. 2017 г.
How do you test for cranial nerve 10?
The motor division of CN 9 & 10 is tested by having the patient say “ah” or “kah”. The palate should rise symmetrically and there should be little nasal air escape. With unilateral weakness the uvula will deviate toward the normal side because that side of the palate is pulled up higher.
How do you test cranial nerve function?
Light touch is tested in each of the three divisions of the trigeminal nerve and on each side of the face using a cotton wisp or tissue paper. The ophthalmic division is tested by touching the forehead, the maxillary division is tested by touching the cheeks, and the mandibular division is tested by touching the chin.