L14: Muscles of the Pectoral Girdle and Arm Flashcards
what are upper appendicular muscles? (hint:5)
- move pectoral girdle
- move glenohumeral joint/arm
- muscles of arm
- muscles of forearm
- intrinsic muscles of hand
What are the movements of the pectoral girdle?
- elevation, depression
- protraction, retraction
- scapula upward and downward rotation
Where do muscles that move the pectoral girdle originate and insert?
- originate on axial skeleton
- insert on pectoral girdle
What are the anterior muscles that move the pectoral girdle? (hint: 3)
- trapezius
- pectoralis minor
- serratus anterior
What are the posterior muscles that move the pectoral girdle? (hint: 5)
- trapezius
- levator scapulae
- rhomboid minor
- rhomboid major
- serratus anterior
What is the external structure of the pectoralis minor?
- fan or convergent
origin and insertion of pectoralis minor?
origin: anterosup. surfaces of ribs 3-5
insertion: coracoid process of scapula
function of pectoralis minor? (hint: 3)
- depress and protract shoulder
- downward rotation of scapula
- elevate ribs
external structure of serratus anterior?
serrated
origin and insertion of serratus anterior?
origin: anterosuperior margins of ribs 1-8 or 9
insertion: anterior surface of vertebral (medial) border of the scapula
function of serratus anterior?
- protract shoulder
- upward rotation of scapula (glenoid cavity points superiorly)
external structure of trapezius?
trapezoid
origin and insertion of trapezius?
origin: occipital bone, ligamentum nuchae, spinous processes of thoracic vertebrae
insertion: clavicle, acromion, spine of scapula
function of trapezius?
-elevate, retract, depress, rotate scapula (upward)
external structure of rhomboid minor/major?
diamond
origin and insertion of rhomboid MINOR?
origin: spinous processes C7-T1
insertion: medial border of scapular (superior to spine)
function of rhomboid minor?
- elevate, retract, downward rotate scapula
origin and insertion of rhomboid MAJOR?
originate: spinous processes T2-T5
insertion: medial border of scapula (inferior to spine)
function of rhomboid major?
- elevate, retract, downward rotate scapula
Origination/insertion of muscles that move the glenohumeral joint?
origin: axial skeleton OR pectoral girdle
insertion: cross the glenohumeral joint
do all glenohumeral joint muscles insert onto the humerus?
no
what are the two types of pectoralis major?
- clavicular head
- sternal head
what are the two types of biceps brachii?
- long head
- short head
external structure of pectoralis major?
- fan or convergent
origin and insertion of pectoralis major?
origin: body of sternum, costocartilages 2-6,, inferomedial portion of clavicle
insertion: greater tubercle and lateral lip of intertubercular groove of humerus
function of pectoralis major?
- flexion, adduction, medial (internal) rotation of arm