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
Page 2 of 10 Page 2 Orofacial Anatomy Chapter 4- Muscular System.docx
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
Page 2 of 10 Page 2 Orofacial Anatomy Chapter 4- Muscular System.docx
