APY 345 Lecture Notes - Lecture 13: Parotid Gland, Sublingual Gland, Frenulum
10 May 2016
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Masseter m: 2 portions superficial and deep portions, closes jaw, trigeminal n. mandibular division. Temporalis m: originates from entire rim of temporal fossa of skull, inserts to coronoid process of mandible, closes the jaw, trigeminal n. mandibular division. Lateral pterygoid m: two heads upper and lower, both= trigeminal n. mandibular division; rotary movement when unilaterally flexed, suprahyoid muscles: trigeminal n. & facial n. innervations. Mylohyoid m: trigeminal n. mandibular division. Digastric m. 2 heads: posterior belly= facial n, anterior belly= trigeminal n. (v3) In monkeys, the digastric tendon forms a sling: evolutionary trends in masticatory apparatus: The jaw: class lever iii, reduce muzzle/deeper mandible. Brings molars close to masseter m: longer masseter m. = more power on molars, anterior teeth. Huge incisors for tearing: fused symphsis menti: see above, simian shelf: a bony thickening on the front of the ape mandible.
