SDL - Oral Cavity and mastication

Eating and drinking sdl..

o   Note in particular:

§  Horse using buccal/tongue pumping to suck up water.

§  Cat drinking: lap-lap-lap-lap-swallow-lap-lap-lap-swallow…etc

§  Dog eating: just bite chomp swallow.

§  Dog chewing bones:

·        Use of carnassial teeth to break bits off – one video shows this action very well.

·        Use of forelimbs to stabilize the bones.

How do mammels chew and breath at the same time?

Seal off the buccal/ oral cavity from the common pharynx. Seal is made from tonguw agaisnt soft pallette. + soft pallete against epiglottis

How do non mammels cope with this..

They do NOT chew.. just bite and tear + swallow large food iterms quickly..o   Do not chew: just bite/tear and swallow large food items quickly. In the case of snakes, their larynx is placed rostrally just caudal to the mandibular symphysis. As the mandibular symphysis widens, the larynx can protrude outside the buccal cavity. In this position it cannot be compressed by the prey item.

o   Crocodilians have a flap (gular flap) at the back of the tongue, which seals the caudal end of the oral cavity. They also have a complete hard palate like mammals. So although they cannot seal their lips, they can hold/grasp prey underwater without risk of water entering the airways from the oral cavity. Their nostrils close to prevent water from entering via the nasal route. Similarly they can hold their breath underwater.

prehnesion>

teeht lips tingue hand feet

What is involved in mastication..

Jaw, tongwu mastictaion muscles +@the TEmporao mandibular joint, and your teeth…

what is difference in reptiles and fish

no chwewing, grab bite and swallonw (some expections shark teear)

some use feet + wedge their prey for prehension

What is the function of salvia

• digestion

• dissolves food

• lubrication

• enzymes

• bicarbonate stuff.

• phosphate buffeer… + aids microbrial greowht (digestion)

• URea and anomiac is returned to rumen byt the saliva, + anti foaming properties

• peroxide based antibacterial system..

What is a salivary mucocle

When there is a pathological build up of saliva, causes a blockage…

What is the membryological origin of the gut endothelium

endoderm

1.      Where is the transition between the skeletal muscles of the oral cavity and the smooth muscle of the stomach?

a.      Oesophagus. Cats, pigs, horses have extensive smooth muscle, other species mainly skeletal muscles until last part of oesophagus.

Why is dental decay rare in domestic animals

a.      Saliva is not acidic, therefore calcium phosphate does not dissolve.

Name the cranial nerves for.. Skin sensation of the lips

V2 = upper V3 - bottom

What cn is responsible for tongue movement

Hypoglossal - controls the intrinsic and extrinsic muscles

what cn are erespons