tongue

Question 1

1. what are the papillae of tongue and their respective locations.
2. which have taste buds?
3. which are associated with salivary glands

Answer 1

note:
Body of tongue = anterior 2/3 of tongue
Root of tongue = posterior 1/3 of tongue
their border is demarcated by sulcus terminalis.
ALL PAPILLAE ARE LOCATED ON BODY OF TONGUE

1. filiform:
   a) dorsal surface of body
2. fungiform:
   a) dorsal surface of body
   b) has taste buds
3. vallate:
   a) dorsal surface of body, just anterior to sulcus terminalis
   b) has taste buds
   c) associated with salivary glands of von ebner
4. foliate:
   a) lateral surface
   b) has taste buds

Question 2

where are the openings of the sublingual and submandibular ducts?

Answer 2

RECALL BODY AND ROOT OF TONGUE ARE ANT 2/3 AND POST 1/3 RESPECTIVLEY

1. sublingual folds are located on the root of the tongue, on the ventral surface.
2. submandibular ducts are located at the medial end of the sublingual folds
3. sublingual ducts are located all along sublingual fold

Question 3

genioglossus

Answer 3

1. 1/4 extrinsic muscles of the tongue
2. superior genial tubercle (named after) aka mental spine–>fascia of dorsal tongue
3. actions 1) bilaterally–>protrusion; 2)unilaterally–>deviation to contralateral side

Question 4

Hyoglossus

Answer 4

1. 1/4 extrinsic muscles of the tongue
2. hyoid bone–>fascia of lateral tongue
3. action: 1) retraction + depression of sides

Question 5

styloglossus

Answer 5

1. 1/4 extrinsic muscles of the tongue
2. styloid process –>fascia of lateral tongue
3. action: 1) up (i.e. elevation) and back during swallowing + elevation of sides

Question 6

palatoglossus

Answer 6

1. 1/4 extrinsic muscles of the tongue
2. palatal aponeurosis–>fascia of lateral tongue
3. action: 1) elevates tongue

Question 7

SOMATIC SENSORY innervation of tongue

Answer 7

1. Anterior tongue - Lingual nerve (CN5/3)

2. Posterior tongue - CN9

Question 8

SPECIAL SENSORY innervation of tongue

Answer 8

1. Anterior tongue
   a) chorda tympani (CN7, HH on lingual)
   b) CN9 - just for vallate tastebuds
2. Posterior tongue - CN9

Question 9

MOTOR innervation of tongue

Answer 9

1. All extrinsic and intrinsic muscles, except for palatoglossus (one of the 4 extrinsic muscles) = CN12
2. Palatoglossus = pharyngeal plexus (CN9 + CN10 +SNS)
3. minor salivary glands of tongue = PNS fibers of chorda tympani (note: chorda tympani has special sensory fibers for taste of anterior tongue + pns for minor salivary glands of tongue)