Orofacial Anatomy – Chapter 4: Muscular System Study Guide

Orofacial Anatomy Chapter 4- Muscular System Orofacial Anatomy Chapter 4- Muscular System 2026-03-10




Orofacial Anatomy: Chapter 4- Muscular System




muscle movement is by our neural control causing the muscle to
shorten in action (true or false)

true

define origin

the end of the muscle that is attached to the LEAST MOVEABLE
structure

define insertion

the end that is attached to the MORE MOVEABLE structure

__________ moves toward _________ causing the muscle to arise during
contraction (aka: action of the muscle)

INSERTION moves toward ORIGIN causing the muscle to arise during
contraction

what are the 6 groups of the head and neck?

1. cervical muscles
2. muscles of mastication
3. hyoid muscles
4. muscles of facial expression
5. muscles of the tongue
6. muscle of the pharynx




Page 1 of 10 Page 1 Orofacial Anatomy Chapter 4- Muscular System.docx

, Orofacial Anatomy Chapter 4- Muscular System Orofacial Anatomy Chapter 4- Muscular System 2026-03-10




Orofacial Anatomy: Chapter 4- Muscular System




what is the function of cervical muscles?

to hold and stabilize the head and position the head to the rest of the
body

cervical muscles: sternocleidomastoid muscle

-largest, paired
-ORIGIN: medial part of clavicle
-INSERTION: mastoid process
-ACTION: rotation of head
-divides the neck into anterior and posterior cervical triangles




cervical muscles: trapezius muscle

-ORIGIN: external surface of occipital bone and posterior midline of the
cervical and thoracic regions
-INSERTION: lateral 3rd of clavicle and parts of scapula
-ACTION: lifts clavicle and scapula




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