Ch. 12 axial muscles (lab.) study guide

Muscle of the face, head, and neck:

Temporalis

Nothing on origin and insertion

actions: closes jaw and elevates/retracts mandible

Muscle of the face, head, and neck:

Orbicularis oculi

nothing on origin and insertions

Actions: blinking and squinting

Muscle of the face, head, and neck:

Orbicularis Oris

nothing on origin and insertion

actions: close lips, kissing, and whistling

Muscle of the face, head, and neck:

Zygomaticus

nothing on origin and insertion

Actions: smiling and laughing

Muscle of the face, head, and neck:

Masseter

Origin: zygomatic bone and maxilla

insertion: Mandible

Actions: closes jaw and elevates mandible

Muscle of the face, head, and neck:

Buccinator

nothing on origin and insertion

Actions: compress cheek, sucking

Muscle of the face, head, and neck:

Sternocleidomastoid

Origin: sternum and clavicle

Insertion: Temporal and Occipital

Actions: Rotate head toward opposite shoulder and neck flexion when both muscles contract

Muscle of the face, head and, neck:

Spenius capitus

nothing on origin and insertion

Actions: As a group extend or hyperextend head; rotate and bend head when only one side is active

Muscles of the chest, abdomen, and back:

Pectoralis major

Origin: sternum, clavicle, ribs, External Oblique muscle

Insertion: Humerus

Actions: Arm flexion and forced inspiration

Muscle of the face head and neck:

Pectoralis Minor

origin: rib

nothing on insertion

Actions: Pulls scapula forward and inferior

Muscle of the face head and neck:

Serratus Anterior

origin: ribs

nothing on insertion

Actions: Abduction and raising of arm

Muscle of the face head and neck:

External intercostals

nothing on origin and insertion

Actions: Elevates ribs-aids in inspiration

Muscle of the face head and neck:

Internal Intercostals (pull in, pull air out)

nothing on origin and insertion

Actions: Lower ribs-aids in forced expiration

Muscle of the face head and neck:

Rectus abdominus

origin: pubic bone

Insertion: Sternum and ribs

Actions: Flexes and rotates vertebral column

Muscle of the face head and neck:

External Oblique

nothing on origin and insertion

Actions: Flexes and rotates vertebral column

Muscle of the face head and neck:

Internal Oblique

nothing on origin and insertion

Actions: Flexes and rotates vertebral column

Muscle of the face head and neck:

Latissimus Dorsi

nothing on origin and insertion

Actions: Arm extension, adduction, and medial rotation of arm

Muscle of the face head and neck:

Erector Spinae

nothing on origin and insertion

Actions: Extend and bend the vertebral column laterally