University:
Missouri State University
Course:
BIO 121 | General Biology I
Academic year:

2019
Views:

207

Pages:

4
Author:

Jarrett Richard

Cranial Nerves PART 3 Gently cut away any remaining dura mater, being careful to preserve as many of the cranial nerves as possible. And the pituitary gland if possible The nerves will appear as white threads attached to the ventral surface of the brain. On this image, the dura matter has been completely removed, you can still see the optic chiasma but the pituitary gland is missing. The infundibulum (pituitary stalk) is now visible in the center. Careful dissection also reveals two other large nerves: the occulomotor nerves. Identify as many of the cranial nerves as possible on your specimen and record your observations: • Olfactory bulb and tract • Optic chiasma / Optic nerve (II) • Trigeminal nerves (V) – involved in chewing and sensations of the head & face; this is a very large nerve tract on the sheep brain • Facial nerves (VII) - large nerves involved in taste sensation, gland function (salivary and lacrimal glands), and facial expressions • Glosso-pharyngeal nerve (IX) – swallowing, saliva production, taste buds; produces gag reflex • Vagus nerves (X) – serve many organs of the head, thorax & abdominal cavity (may be broken in your specimen)