Summary Muscles Of Mastication in Human

AN
ASSIGNMENT
ON
' MUSCLES OF MASTICATIONS '


1st YEAR B.H.M.S ( SESSION: 2022- 23 )
ROLL NO - 18

UNDER THE GUIDANCE OF:
DR. SWAPAN KUMAR HALDAR (PROF & H.O.D)
DR. ARINDAM PAL (LECTURER)


DEPT.- HUMAN ANATOMY.

, MUSCLES OF MASTICATION


The muscles of mastication move the mandible during mastication and Speech. The
muscles are -

Masseter muscle

Temporalis muscle

Lateral pterygoid muscle

Medial pterygoid muscle

They develop from the mesoderm of the first branchial arch and are Supplied by the
mandibular nerve which is the nerve of that arch.

Masseter Muscle:

This muscle is quadrilateral and covers Lateral Surface of ramus of mandible. It has
three Layers.

Origin

a. Superficial Layer (Largest): From anterior two-thirds of Lower border of Zygomatic
arch and adjoining zygomatic Process of maxilla.

b. Middle Layer: From lower border of Posterior one- third of Zyomatic arch.

C. Deep Layer: From deep surface of Zygomatic arch.

Insertion

a. Superficial Layer into the lower part of the Lateral Surface of ramus of mandible.

b. Middle Layer into the central part of ramus of the mandible.

C. Deep Layer into rest of the ramus of the mandible.

Nerve Supply

By Masseteric nerve, a branch of anterior division of mandibular nerve.

Actions

a. Elevates mandible to close the mouth to bite.

b. Superficial fibres cause protrusion.