M106 Muscles

Question 1

Origin; zygomatic arch
Insertion; angle and ramus of mandible
Action; elevates the mandible and assists in protraction

Answer 1

Massater

Question 2

Origin; temporal fossa and fascia
Insertion; coronoid process& anterior ramus of the mandible
Action; elevates and retracts the mandible

Answer 2

Temporalis

Question 3

Origin; varies
Insertion; Hyoid bone
Action; Supra- elevates the hyoid and depresses the mandible
Infra-depresses the hyoid

Answer 3

Infra and Suprahyoids

Question 4

Origin; fascia covering the superior part of pec major
Insertion; Base of mandible, skin and lower part of face
Action; Tightens fascia of the neck, assists in depressing the mandible, draws down the corners of the mouth

Answer 4

Platysma

Question 5

Actions;
Unilaterally- w/ ribs fixed, lateral flexion of neck to the same side. Rotation of neck to same side
Bilaterally- Elevation of ribs during inhalation. flexion of head and neck

Answer 5

All Scalenes

Question 6

Origin; Sphenoid bone
Insertion; Medial- Medial surface of ramus of the mandible
Lateral- articular disk and tmj capsule, neck of mandible
Action; Unilaterally- laterally deviates the mandible to opposite side. Bilaterally- Protracts the mandible

Answer 6

Pyterygoids
lateral and medial

Question 7

Origin; transverse processes of C-3-C-6
Insertion; first rib

Answer 7

Anterior Scalene

Question 8

Origin; Transverse processes of C2-C7
Insertion; first rib

Answer 8

Middle scalene

Question 9

Origin; transverse processes of C6&C&
Insertion; second rib

Answer 9

Posterior Scalene

Question 10

Origin; Sternal head- manubrium of sterunum. Clavicular head- medial clavicle
Insertion; mastoid process of the temporal bone
Action; Bilateral- flexion of the neck
Unilaterally- rotation of neck to opposite side, lateral flexion of the neck

Answer 10

SCM
Sternocliedomastiod

Question 11

Origin; fascia and spinous process C7-T4
Insertion; Mastiod process of temporal bone
Action; Bilaterally- Extends head and neck
Unilaterally- Rotate neck to same side and lateral flexion of neck

Answer 11

Splenius Capitus

Question 12

Actions; Bilaterally- extends spine
Unilaterally- Lateral flexion of the spine and rotation of trunk to same side

Answer 12

Erector Spinae (group)

Question 13

Origin; spinous process of T3-T6
Insertion; posterior tubercles of transverse processes C1-C3
Actions; Bilaterally- extends head and neck
Unilaterally- rotation of head and neck to same side, also lateral flexion

Answer 13

Splenius Cervicus