Special Senses - Gustatory

Question 1

Taste buds

Answer 1

• contain receptors
• modality- chemoreceptors
• organ of taste
• located on papillae of tongues, roof of mouth cheeks and throat
• 50-100 taste cells each

Question 2

Taste receptor

Answer 2

• chemoreceptors
• taste cell - modified epithelial cells that function as receptors
• taste hairs- microvilli that protrude from taste cell ( sensitive part of taste cell)

Question 3

Type of papillae

Fillaform

Fungiform

Vallate

Answer 3

Elongated ( fillaform)

Mushroom shape ( fungiform)

Vallate- curcumvallate ( round)

Question 4

Tastebud anatomy

Answer 4

Taste cell- receptor

Support cell- organize taste cells

Microvilli-contain special membrane receptor for chemical attachment - receptors create nerve impulse- increase surface areA

Question 5

Function of buds ( pathway)

Answer 5

Detect chemical molecules in food dissolved in saliva- molecules bind to receptor protein in microvilli of tastebud- stimulates taste cell to send an impulse through sensory nerve fibers ( activating) - impulse moves to parietal lobe of cerebrum - taste is interpreted

Question 6

Cranial nerve VII - facial nerve

Answer 6

Activates 2/3 of taste buds

IX and X aide too

Question 7

Gustatory pathway

Answer 7

Receptors on bud- facial nerve7,9,10- solitary nucleus in medulla oblongata ( group of neurons) - midbrain/pons (brain stem)- thalamus nucleus ( sensory area of brain) - gustatory cortex ( taste center) - found on partial lobe (back of brain) aka gustatory center

Question 8

Tastebuds are (modality)

Answer 8

Chemoreceptors

Question 9

5 primary taste

Answer 9

1. Salty (NaCl)
2. Sour acid- free hydrogen ion H+
   3 sweet glucose
3. Bitter chemically diverse poison/ toxians
4. Umami- savory

Back of tongue- bitter
Posterior sides- sour
Anterior sides- salt
Tip- sweet

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