muscle tissue and axial muscle terms

origin of a muscle

less moveable end of a muscle

insertion of a muscle

more moveable end of a muscle

circular muscle

fibers form a continuous circle

convergent muscle

muscle is broad at origin but converges to a thin insertion

parallel muscle

fibers are parallel, muscle is long and thin

pennate muscle

have tendons that attach to fibers

origin of sternocleidomastoid

manubrium of sternum & medial clavicle

insertion of sternocleidomastoid

mastoid process of temporal bone

action of sternocleidomastoid

flexion of head & neck, rotation of head

origin of pectoralis major

clavicle, sternum & costal cartilages of ribs 1-7

insertion of pectoralis major

intertubercular sulcus of humerus

action of pectoralis major

flexes, adducts & medially rotates arm

origin of trapezius

occipital bone & spinous processes C7-T12

insertion of trapezius

clavicle, spine & acromion of scapula

action of trapezius

extends head; elevates, superiorly rotates, retracts & depresses scapula

origin of latissimus dorsi

spinous processes T7-12, ribs 8-12, & iliac crest

insertion of latissimus dorsi

xiphoid process of sternum & costal cartilages of ribs 5-7

action of latissimus dorsi

extends, adducts & medially rotates arm

origin of rectus abdominis

pubic crest & symphysis

insertion of rectus abdominis

xiphoid process of sternum & costal cartilages of ribs 5-7

action of rectus abdominis

flexes vertebral column & compresses abdominal wall; forced expiration