Nervous system - cranial nerves, Biology

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CRANIAL NERVES

12 pairs. Total weight 12 gms.
Upto amphibian 10 pairs cranial nerves are present.
1, 2, 8, - sensory. 3, 4, 6, 11, 12, motor. 5, 7, 9, 10 - mixed.
3, 7, 9, 10 th attached to ANS also.

S.N. 1.	NO. I	NAME Olfactory	ORIGIN & DISTRIBUTION Olfactory epithelium
2.	II	Optic	Retina
3.	III	Oculomotor	Eye muscle
4.	IV	Pathetic (Trochlear)	Eye muscle
5.	V	(Smallest) Trigeminal (Thickest)
		Dentist Nerve
		In it glassarian ganglion present

		(a) Ophthelmic (b) Maxillary (c) Mendibular	Snout Upper jaw Lower jaw
6.	VI	Abducens (Thinnest)	Eye muscle
7.	VII	Facial
		(a) Palatine	Buccal cavity
		(b) Hyomendibular	Tongue
8.	VIII	(c) Chorda tympani Auditory	Salivary gland
		(a) Vestibular
9.	IX	(b) Cochlear Glossopharyngeal	Ear
		(a) Lingual	Tongue
10.	X	(b) Pharyngeal Vagus (Largest)	Pharynx
		(a) Anterior laryngeal	Larynx
		(b) Cardiac depressor	Heart
		(c) Recurrent laryngeal	Larynx
		(d) Main vagus	Heart, Lungs, Stomach, Intestine
		Also known as pneumogestric
		or wandering nerve.
11.	XI	Accessory Spinal	Muscle of neck & shoulder
12.	XII	Hypoglossal	Tongue & lower jaw

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