Pectoral Girdle Flashcards
What are these two parts
How is the shoulder girdle attached to the upper limb?
- at the shoulder joint
- multi-axial ball and socket joint
What are the 3 joints of the shoulder girdle?
- sternoclavicular
- acromioclavicular
- glenohumeral
What are these 3 joints?
What 2 muscle groups stabilise and move the shoulder girdle?
locations
Back - connects to vertebral column
Pectoral region - attached to ribs
What muscles make up the back muscle group?
That stabilise and move the shoulder girdle
- Trapezius
- Levator Scapulae
- Rhomboid major
- Rhomboid minor
What muscles make up the pestoral region muscle group?
That stabilise and move the shoulder girdle
- Pectoralis minor
- Serratus Anterior
What muscle is this?
Trapezius
What is the origin of the trapezius?
Skull and cervical vertebrae
What is the insertion of the trapezius?
Scapula and clavicle
What is the role of the trapezius?
elevates, rotates, retracts scapula
What is the origin of the levator scapulae?
Upper cervical vertebrae
What is the insertion of the levator scapulae?
medial scapula above spine
What muscle is this?
levator scapulae
What is the role of the levator scapulae?
Elevates medial border of scapula
What is the origin of the rhomboid minor?
Lower cervical verterbrae
What is the insertion of the rhomboid minor?
medial scapula at spine
What muscle is this?
rhomboid minor
What is the role of the rhomboid minor?
Retracts and rotates scapula
What is the role of the rhomboid major?
Retracts and rotates scapula
What is the origin of the rhomboid major?
Upper thoracic vertebrae
What is the insertion of the rhomboid major?
Medial scapula, below spine
What muscle is this?
rhomboid major
What is the role of the pectoralis minor?
- draws scapula forwards
- Depresses and downwardly rotates scapula
- Stabilises scapula
What is the origin of the pectoralis minor?
Surface of ribs 3,4,5
What is the insertion of the pectoralis minor?
Scapula
What muscle is this?
pectoralis minor
What is the role of the Serratus anterior?
- protracts and stabilises scapula against thorasic wall
- Effectively elongates upper limb
- Assists in upward rotation of scapulaa
What is the origin of the Serratus anterior?
lateral surface of ribs 1-8
What is the insertion of the Serratus anterior?
scapula, medial border
What muscle is this?
Serratus anterior
What role do the pectoralis major and latissimus dorsi play in the pectoral girdle?
stabilises shoulder joint and upper arm
What is the role of the pectoralis major?
- flexion of arm
- abduction of humerous
- medial rotation of humerous
- accessory for respiration
What is the origin of the pectoralis major?
Clavicle & sternum
What is the insertion of the pectoralis major?
humerus
What muscle is this?
pectoralis major
What is the role of the latissimus dorsi?
- extend and adduct humerus
- medial rotation humerus
- downward rotation of scapula
What is the origin of the latissimus dorsi?
- vertebrae
- lower ribs
- hips
What is the insertion of the latissimus dorsi?
humerus
What muscle is this?
latissimus dorsi
