Lab 6 - Muscles of the Chest, Shoulder, and Brachium

Question 1

Tendon of origin

Answer 1

attachemtn point for a muscle

Question 2

Tendon of Insertion

Answer 2

attachment point for a muscle

Question 3

Belly (=gaster)

Answer 3

main mass of a muscle

Question 4

Synovial Tendon Sheath

Answer 4

lubricated sheath surrounding tendons

Question 5

Retinacula

Answer 5

connective tissue bands that hold tendone near adjacent bones

Question 6

Deep Fascia

Answer 6

dense fibrous connective tissue associated with muscles systems

Question 7

Hiatus

Answer 7

passageway for a tendon, vessel, or nerve

Question 8

Fascia compartments

Answer 8

fascial systems that enclose muscles in compartments

Question 9

ant

Answer 9

• Muscle: Deltoid
• Origin: distal 1/3 of clavicle acrimon process; lateral spine of scapula
• Insertion: deltoid tuberosity of humerus
• Action:
  
  • Anterior - flexion of humerus @ shoulder
• Middle - abduction of humerus @ shoulder
• Posterior - assist in full abduction of humerus

Question 10

ant

Answer 10

• Muscle: Pectoralis major
• Origin: clavicle, sternum, costal cartilages
• Insertion: crest of greater tubercle of humerus
• Action: adducts arm; medial rotation of humerus

Question 11

post

Answer 11

• Muscle: Teres major
• Origin: inferior angle of scapula
• Insertion: medial lip of intertubercular groove of humerus
• Action:
  
  • extension of humerus @ shoulder
  • medial rotation of humerus

Question 12

ant

Answer 12

• Muscle: Biceps brachii
• Origin:
  
  • long head - superior margin of suprglenoid tubercle
  • short head - coracoid process
• Insertion: radial tuberosity of radiu
• Action:
  
  • long head - adduction of shoulder
  • short head - supination of forearm; flexion of elbow

Question 13

ant

Answer 13

• Muscle: Brachialis
• Origin: distal anterior surface of humerus
• Insertion: coronoid process of ulna
• Action: flexion of elbow

Question 14

ant

Answer 14

• Muscle: Pectoralis mino
• Origin: ribs 3, 4, 5 near costal cartilage
• Insertion: coracoid process of scapula, medial aspect
• Action: depress scapula; scapula downward rotation; elevates ribs

Question 15

ant

Answer 15

• Muscle: Coracobrachialis
• Origin: apex of coracoid process
• Insertion: medial humerus
• Action: flexion & adduction of humerus @ shoulder

Question 16

post

Answer 16

• Muscle: Triceps brachii
• Origin:
  
  • long head - infraglenoid tubercle
  • lateral head - posterior humerus
  • medial head - posterior distal humerus
• Insertion: olecranon process of ulna
• Action: extension of elbow, adduction of shoulder

Question 17

post

Answer 17

• Muscle: Supraspinatus
• Origin: medial 2/3 of supraspinatus fossa of scapul
• Insertion: superior facet of greater tubercle of humerus
• Action: shoulder abduction

Question 18

post

Answer 18

• Muscle: Infraspinatus
• Origin: medial 2/3 of infraspinatus fossa of scapula
• Insertion: middle facet of greater tubercle of humerus
• Action: lateral rotation of shoulder

Question 19

post

Answer 19

• Muscle: Teres minor
• Origin: axillary border of scapula (upper 2/3)
• Insertion: lowermost part of greater tubercle of humerus
• Action:
  
  • extends shoulder
  • lateral rotation of humerus
  • stabilizes shoulder

Question 20

ant

Answer 20

• Muscle: Subscapularis
• Origin: subscapular fossa of scapula
• Insertion: lesser tubercle of humerus
• Action: medial rotation of humerus at shoulder; adduction of humerus

Question 21

post

Answer 21

• Muscle: Levator scapulae
• Origin: transverse process of C1-C4
• Insertion: superior angle of scapula
• Action: scapula elevation & rotation

Question 22

post

Answer 22

• Muscle: Supraspinatus
• Origin: medial 2/3 of supraspinatus fossa of scapula
• Insertion: superior facet of greater tubercle of humerus
• Action: shoulder abduction

Question 23

post

Answer 23

• Muscle: Rhomnoid major
• Origin: spinous process of T1-T5
• Insertion: vertebral border of scapula from foor of its spine to apex
• Action: scapula retraction & elevation

Question 24

post

Answer 24

• Muscle: Rhomboid minor
• Origin: spinous process of C7 & T1
• Insertion: vertebral border of scapula @ root of spine
• Action: scapula retraction & elevation

Question 25

post

Answer 25

* **Muscle:** Trapezius * **Origin:** * external occipital protuberance & nuchal line * C6 - T12 spinous processes * **Insertion:** spine of scapula, acrimon process, distal clavicle * **Action:** * upper - elevation and upward scapular rotation * middle - scapula retraction * lower - scapula upward rotation & depression; braces shoulder

Question 26

post

Answer 26

* **Muscle:** Latissimus dorsi * **Origin:** * spinous processes of lower thoracic vertebrae * lumber & sacral vertebrae * iliac crest * lower 3-4 ribs * **Insertion:** lower portion of intertubercular groove of humerus * **Action:** * extension of humerus at shoulder * medial rotation at humerus * adduction of humerus at shoulder