A&P 1.10

Question 1

Muscle Terminology

Define muscle belly

Answer 1

fleshy portion of muscle that’s responsible for muscle contraction

Question 2

Muscle Terminology

Define muscle tendon

Answer 2

dense collagen fibers which attach muscle to bone

Question 3

Muscle Terminology

Define aponeurosis

Answer 3

broad, dense sheet of CT that connects - ms-ms
- ms-bone
- ms-skin

Question 4

Muscle Terminology

Define origin

Answer 4

• proximal or superior attachment
• attaches on a less movable bone

Question 5

Muscle Terminology

Define insertion

Answer 5

• distal or inferior attachment
• attaches on a more movable bone

Question 6

Muscle Fasciculi

List the 4 ways fasciculi are arranged

Answer 6

1. Parallel
2. Pennate
3. Convergent
4. Circular

Question 7

Muscle Fasciculi

Describe parallel arrangement

Answer 7

Fascicles lay parallel to one another (same fiber direction)

Question 8

Muscle Fasciculi

Describe pennate arrangement

Answer 8

• feathering arragenemtn of fascicles
• can be either uni (half feather) or bipennate (full feather)

Question 9

Muscle Fasciculi

Describe convergent fascicle arrangement

Answer 9

fibers have multiple origins that converge at one insertion point

Ex: glutes, deltoids

Question 10

Muscle Fasciculi

Describe circular fascicle arrangement

Answer 10

circle shaped fibers

Ex: orbit, mouth, sphincters

Question 11

Naming Skeletal Muscles

List the different methods of naming muscles

Answer 11

1. Relative size
2. Location
3. Shape
4. Muscle fiber direction
5. Number of origins
6. Location of ms attachment points
7. Action

Question 12

Naming Skeletal Muscles

Examples of naming by relative size

Answer 12

Gluteus
- Maximus
- Medius
- Minimus

Question 13

Naming Skeletal Muscles

Examples naming skeletal muscles by location

Answer 13

Tibialis anterior vs posterior

Question 14

Naming Skeletal Muscles

Examples of skeletal muscles named based on shape

Answer 14

• deltoid
• rhomboids

Question 15

Naming Skeletal Muscles

Examples of muscles named by fiber direction

Answer 15

Rectus femoris

Question 16

Naming Skeletal Muscles

Examples of muscles named by number of origins

Answer 16

• Triceps
• Biceps

Question 17

Naming Skeletal Muscles

Examples of naming skeletal muscles by location of the muscle attachment points

Answer 17

Sternocleidomastoid

Question 18

Naming Skeletal Muscles

Examples of naming skeletal muscles by action

Answer 18

• Extensors
• Flexors

Question 19

Rotator Cuff Muscles

Name the 4 rotator cuff muscles

Answer 19

• Supraspinatus
• Infraspinatus
• Teres minor
• Subscapularis

Question 20

Rotator Cuff Muscles - Location, Origin, Insertion, Action

Supraspinatus

Answer 20

L: Posterior shoulder deep
O: Supraspinous fossa of scapula
I: Greater tubercle of humerus (superior facet)
A: ABducts arm at shoulder

Question 21

Rotator Cuff Muscles - Location, Origin, Insertion, Action

Infraspinatus

Answer 21

L: Posterior shoulder superficial
O: Infraspinous fossa of scapula
I: Greater tubercle of humers (intermediate facet)
A: Laterally rotates arm at shoulder

Question 22

Rotator Cuff Muscles - Location, Origin, Insertion, Action

Teres Minor

Answer 22

L: Posterior axilla superficial
O: Superior 1/2 of lateral border of scapula
I: Greater tubercle of humerus (Inferior facet)
A: Laterally rotates arm at shoulder

Question 23

Rotator Cuff Muscles - Location, Origin, Insertion (Action)

Subscapularis

Answer 23

L: Anterior scapula deep
O: Subscapular fossa of scapula
I: Lesser tubercle of humerus
A: Medially rotates arm at shoulder

Question 24

Scapula & Posterior Arm Muscles

List the muscles

Answer 24

• Teres major
• Triceps brachii

Question 25

# Scapula & Posterior Arm Muscles - L, O, I, A Teres major

Answer 25

L: Posterior axilla superficial O: Inferior angle (lateral side) and lower 1/2 lateral border of scapula I: Bicipital groove of humerus (medial lip) A: "_____" of arm at shoulder - Extension - ADduction - Medial rotation

Question 26

# Scapula & Posterior Arm Muscles - L, O, I, A Triceps brachii

Answer 26

L: Posterior arm superficial O: - Long head: infraglenoid tubercle of scapula - Lateral head: posterior, proximal half of humerus - Medial head: posterior, distal half of humerus I: olecranon process of ulna A: extends forearm at elbow (long head also extends arm at shoulder)

Question 27

# Anterior Arm Muscles List the muscles

Answer 27

- Brachialis - Biceps brachii

Question 28

# Anterior Arm Muscles - L, O ,I ,A Brachialis

Answer 28

L: Anterior arm deep O: Distal 1/2 of anterior surface of humerus I: Proximal ulna A: Flexion of forearm at elbow

Question 29

# Anterior Arm Muscles - L, O, I, A Biceps brachii

Answer 29

L: Anterior arm superficial O: - Short head: coracoid process of scapula - Long head: supraglenoid tubercle of scapula I: Radial tuberosity and proximal ulna (by way of biciptal aponeurosis) A: "________" forearm at elbow - flexion - supination (short head also flexes arm at shoulder)

Question 30

# Lateral Arm Muscles - L, O, I, A Deltoid

Answer 30

L: Lateral shoulder superficial O: - Anterior: Lateral 1/3 of clavicle - Middle: Acromion - Posterior: Spine of scapula - I: Deltoid tuberosity of humerus - A: - Anterior: Flexion, medial rotation - Mid: ABduction - Posterior: Extension & lateral rotation of arm at shoulder

Question 31

# Deep Posterior/Lateral Forearm Muscles - L, O, I, A Supinator

Answer 31

L: Posterior, lateral forearm deep O: Lateral epicondyle of humerus & posterior border of ulna I: Proximal 1/3 of radius A: Supination of forearm at elbow

Question 32

# Superficial Posterior Forearm Muscles - L, O, I, A Extensor Carpi Radialis Brevis

Answer 32

L: Posterior forearm superficial O: Kateral epicondyle of humerus I: Base of 3rd metacarpal A: Extension & radial deviation of hand at wrist

Question 33

# Superficial Posterior Forearm Muscles - L, O, I, A Extensor Carpi Radialis Longus

Answer 33

L: Posterior forearm superficial O: Lateral supracondylar ridge of humerus I: Base of 2nd metacarpal A: Extensoin & radial deviation of hand at wrist

Question 34

# Deep Posterior Forearm Muscles - L, O, I, A Extensor Indicis

Answer 34

L: Posterior forearm deep O: Ulna & interosseous membrane I: Base of intermediate phalanx of index finger A: Extension of index finger

Question 35

# Deep Posterior Forearm Muscles - L, O, I, A Extensor Pollicis Brevis

Answer 35

L: Posterior forearm deep O: Radius & interosseous membrane I: Base of proximal phalanx of thumb A: Extension of thumb ## Footnote Part of anatomical snuff box

Question 36

# Deep Posterior Forearm Muscles - L, O, I, A Extensor Pollicis Longus

Answer 36

L: Posterior forearm deep O: Middle 1/3 of ulna & interosseous membrane I: Base of distal phalanx of thumb A: Extension of thumb ## Footnote Part of anatomical snuff box

Question 37

# Deep Posterior Forearm Muscles - L, O, I, A Abductor Pollicis Longus

Answer 37

L: Posterior forearm deep O: Ulna, radius & interosseous membrane I: Base of 1st metacarpal A: Abduction & extension of thumb ## Footnote Part of anatomical snuff box

Question 38

# Superficial Posterior Forearm Muscles - L, O, I, A Extensor Digitorum

Answer 38

L: Posterior forearm superficial O: Lateral epicondyle of humerus I: Distal phalanges of medial 4 digits A: Extension of phalanges

Question 39

# Superficial Posterior Forearm Muscles - L, O, I, A Extensor Carpi Ulnaris

Answer 39

L: Posterior forearm superficial O: Lateral epicondyle of humerus I: Base of 5th metacarpal A: Extension & ulnar deviation of hand at wrist

Question 40

# Superficial Posterior Forearm Muscles - L, O, I, A Extensor Retinaculum (not a muscle)

Answer 40

L: CT band around posterior wrist O: Attaches at distal radius & ulna I: n/a A: Keeps extensor tendons from bowing out

Question 41

# Superficial Posterior Forearm Muscles - L, O, I, A Anconeus

Answer 41

L: Posterior forearm superficial O: Lateral epicondyle of humerus I: Olecranon process & lateral edge of ulna shaft A: Extends elbow (ABducts ulna during supination)