A&P1.20

Question 1

Pectoral & Scapula Muscles - L, O, I, A

Rhomboid Minor

Answer 1

L: Posterior midback intermediate
O:
- Ligament of nuchae
- Spinous processes of C7 & T1

I: Root of spine of scapula
A: ADuction (retration) of scapula

Parallel fibers

Question 2

Pectoral & Scapula Muscles - L, O, I, A

Rhomboid Major

Answer 2

L: Posterior midback intermediate
O: Spinous processes of T2-T5
I: Medial border of scapula from spine to inferior angle
A: ADduction (retraction) of scapula

Parallel fibers

Question 3

Pectoral & Scapula Muscles - L, O, I, A

Levator Scapulae

Answer 3

L: Posterior Neck/Shoulder Intermediate
O: Transverse processes of C1-C4
- C4 => superior angle of scapula
- C3 => more medial on superior angle
- C2 => more medial on superior angle
- C1 => same as C2

I:
- Medial border (superior portion) of scapula
- Superior angle of scapula

A: Elevation of scapula

- Deep to trapezius muscle
- Has a twisting muscle belly

Question 4

Pectoral & Scapula Muscles - L, O, I, A

Trapezius

Answer 4

L: Posterior neck/back superficial
O:
- Superior nuchal line
- External occipital protuberance
- Ligament of nuchae
- Spinous processes of C7-T12

I: (same as deltoid)
- Lateral 1/3rd of clavicle (upper trap)
- Acromion (middle trap)
- Spine of scapula (lower trap)

A:
-Elevation
- ADduction (retraction) & depression of scapula
- Extension of head at neck

- Upper = oblique
- Middle= horizontal
- Lower = oblique

• Does not have an attachment to the ribs

Question 5

Pectoral & Scapula Muscles - L, O, I, A

Latissimus Dorsi

Answer 5

L: Posterior back superficial
O:
- Spinous processes of T7-T12
- Thoracolumbar fascia
- Iliac crest
- Inferior 3 or 4 ribs

I: Floor of bicipital (intertubercular) groove of humerus
A:
- Extension of arm at shoulder
- Medial rotation of arm at shoulder
- ADduction of arm at shoulder

Convergent fibers

• The only muscle that attaches the upper body to lower body

Question 6

Pectoral & Scapula Muscles - L, O, I, A

Pectoralis Minor

Answer 6

L: Anterior chest deep
O: 3rd, 4th and 5th ribs
I: Coracoid process of scapula
A:
- Assists in forced inhalation
- ABduction & depression of scapula

Question 7

Pectoral & Scapula Muscles - L, O, I, A

Pectoralis Major

Answer 7

L: Anterior chest superficial

O:
~Clavicular head: Medial 1/2 of clavicle
~Sternocostal head:
- Sternum
- Superior 6 costal cartilages

I: Lateral lip of bicipital (intertubercular) groove of humerus
A:
- Clavicular head:
**Flexion of arm at shoulder
- Sternal head
**ADduction & medial rotation of arm at shoulder

Convergent fibers

Question 8

Anterior Axillary Fold contains

Answer 8

Pectoralis major

Question 9

Posterior Axillary Fold contains

Answer 9

• Lats
• Teres major

Question 10

Muscles in the Bicipital Groove

Answer 10

• Biceps
• Lats
• Teres major
• Pec major

Question 11

Posterior Triangle

Bordered by…

Answer 11

• SCM
• Traps (upper)
• Clavicle