CH 4 KHP
Terms
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- what is the only bony link from the appendicular skeleton to the axial skeleton?
- clavicle
- what joint is a synovial, arthrodial (gliding) joint where the clavicle joins the sternum, that is the fulcrum of shoulder girdle movements
- sternoclavicular joint
- what is a synovial, arthrodial joint between acromion process of scapula and acromial end of clavicle, thats often injured?
- acromioclavicular joint
- shoulder girdle movements =
- scapula movements
- scapula moves laterally away from spinal column; reaching forward
- abduction
- scapula moves medially toward spinal column; pinching shoulder blades together
- adduction
- inferior angle moves laterally and superiorly; glenoid fossa turns upward; shoulder joint=abduction
- upward rotation
- inferior angle returns medially and inferiorly towards spinal column; glenoid fossa turns downward; shoulder joint=adduction
- downward rotation
- upward or superior movement; shrugging shoulders
- elevation
- downward or inferior movement; returning from shrug
- depression
- what work together in carrying out upper extremity activities
- shoulder joint and shoulder girdle
- shoulder girdle muscles do not attach to the______and do not cause actions at the
- humerus; shoulder joint
- what stabilize scapula so shoulder joint muscles have stable base from which to exert force for moving humerus
- shoulder girdle muscles
- what contract to move shoulder girdle to enhance movement of upper extremity when shoulder goes through extreme ranges of motion?
- shoulder girdle muscles
- all originate on axial skeleton; all insert on scapula and/or clavicle
- 5 shoulder girdle muscles
- what do not attach to the humerus and do not cause shoulder joint actions
- 5 shoulder girdle muscles
- whats the general purpose of the 5 shoulder girdle muscles?
- stabilize scapula during movements of humerus
- name the 5 shoulder girdle muscles
- Trapezius, Levator Scapulae, Rhomboids (major+minor), Serratus anterior, Pectoralis minor
- which two SG muscles are anterior
- serratus anterior, and pectoralis minor
- where does the upper origin of the trapezius originate ?
- base of skull and neck ligs
- middle origin of trapezius originate?
- spines of C7 and T1-T3
- Lower origin of trapezius originate?
- spines of T4-T12
- insertions of upper trapezius
- lateral 1/3 clavicle
- insertions of middle trapezius
- acromion process and scapular spine
- insertion of lower trapezius
- scapular spine
- axns of upper trapezius
- elevation, extension and rotation of head
- axns of mid. trap
- elevation, upward rotation, and adduc.
- axn of lower trap
- depression, upward rotation, adduc.
- minor role in elevation of clavicle or head movement
- upper fibers
- much stronger and thicker fibers of trap
- mid fibers
- assistive role to middle fibers of trap
- lower fibers
- what prevents the glenoid fossa and scapula from being pulled down when lifting objects with arms
- trapezius
- shrugs work what fibers
- upper and middle
- bent rowing work what fibers
- middle n lower
- Origin of levator scapulae
- transverse process of C1-C4
- insertion of levator scapulae
- superior border of scapula (above base of spine)
- axns of levator scapulae
- elevation
- when only one side is used of the levator scapulae=
- lateral neck flexion (while scapula is fixed by pectoralis minor)
- origin of rhomboids
- spines c7-t5
- insertion of rhomboids
- medial border of scapula
- axns of rhomboids
- adduction; draws scapula toward spinal column; and downward rotation
- fxn of rhomboids
- fix scapula during add or ext. of shoulder jt
- chin ups and dips work what
- rhomboids
- origin of serratus anterior
- surface of upper 9 ribs (side of chest)
- insertion of serratus anterior
- medial border of scapula (anterior aspect; whole length)
- axns of serratus ant.
- abduction and upward rotation
- fxns of serratus ant
- used in movements forward with slight upward rotation (throwing baseball, shooting and guarding in bball)
- exercises to work serrratus ant
- pushups, bench press, overhead press
- origin of pect. minor
- anterior surfaces of 3-5 ribs
- insertion of pect. minor
- coracoid process of scapula
- axns of pect minor
- abd, downward rotation, and depression
- fxns of pect minor
- antagonistic and synergistic w/ serratus anterior.
- pect minor + serratus ant. =
- abduction
- exercises to work pectoralis minor
- pushups, bench press, and overhead press
- subclavius muscle for
- stabilization and protection of sternoclavicular jt, depression