Lab 6 Quiz

Bones of the Right Arm

1. black medially

2. black laterally

3. middle red

4. green

5. fingers red

1. ulna

2. radius

3. carpal

4. metacarpel

5. phalanges

Joints of the hand

1. black

2. blue

3. red

4. green

1. Carpo-metacarpal joints

2. Metacarpal phalangeal joints

3. Proximal Interphalangeal joints

4. Distal Interphalangeal joints

Radius

1. Top Right Arrow

2. Top left Arrow

3. Middle Right Arrow

4. Middle Arrow

5. Bottom Arrow

1. Head

2. Neck

3. Radial tuberosity

4. Shaft

5. Styloid process

what in Humerus means “process” in Ulna

fossa ex: Olecranon fossa v Olecranon process

Name parts top to bottom of right humerus (1-12 + thing right above capitulum)

1. head

2. greater tubercle

3. anatomical neck

4. lesser tubercle

5. surgical neck

6. deltoid tuberosity

7. shaft

8. coronoid fossa

9. lateral epicondyle

10. medial epicondyle

11. capitulum (above it is the radial fossa)

12. trochlea

name right humerus

1. radial groove

2. olecranon fossa

Ulna (dark blue part at bottom)

head

Ulna (orange)

Shaft

Ulna (bright light green)

coronoid process

Ulna (top grey part)

olecranon process

Ulna (purple)

trochlear notch

Ulna (yellow)

radial notch

Radius and Ulna Articulation

• Radius head

• Radial notch of Ulna

Radius and Humerus Articulation

• Radius Head

• Capitulum of Humerus

Ulna and Humerus Articulation (3)

1. coronoid process and coronoid fossa

2. olecranon process and olecranon fossa

3. trochlear notch and trochlea

hand and digits categorized how

carpel → metacarpel → proximal phalanges → (middle phalanges) → distal phalanges (Thumb is 1 and Pinky is 5)

(ex: Thumb- metacarpal 1, proximal phalanx 1, distal phalanx 1)

What is the brachial plexus?

A network of nerves from C5–T1 that supplies movement and sensation to the upper limb.

What are the five organizational levels of the brachial plexus?

Roots (5) → Trunks (3) → Divisions (3 anterior and 3 posterior) → Cords (3: lateral, medial, and posterior) → Branches (lot but 5 main ones)

What are the five major terminal branches?

Musculocutaneous, Axillary, Radial, Median, Ulnar (MARMU).

Hand flexors are more likely to be innervated by which nerve? What about hand extensions

flexing: median

extensors: Radial

What muscle is the top one, where is it, and whats its action

Pronator teres

• Superficial, near the elbow

• Pronates the forearm

What muscle is the bottom one, where is it, and whats its action

Pronator quadratus

• Deep, near the wrist, between the radius and ulna

• Pronates the forearm

What muscle is this, where is it, and whats its action

Supinator

• deep, near the elbow

• supinates the forearm

What muscle is the top one, where is it, and whats its action

Palmaris longus

• Superficial, middle of anterior forearm

• Weakly flexes wrist; tightens palm fascia

What muscle is the middle right, where is it, and whats its action (+ nerve)

Flexor carpi ulnaris

• Superficial, pinky side of anterior forearm

• Flexes wrist and moves it toward pinky

• Ulnar nerve

What muscle is on the left, where is it, and whats its action (+ nerve)

Flexor carpi radialis

• Superficial, thumb side of anterior forearm

• Flexes wrist and moves it toward thumb

• Median nerve

What muscle is on the bottom right, where is it, and whats its action

Flexor digitorum superficialis

• Intermediate layer of anterior forearm

• Flexes fingers, mainly at PIP joints

What muscle is the right, where is it, and whats its action (+ nerve)

Flexor digitorum profundus

• Deep, pinky/ulnar side of anterior forearm

• Flexes fingers, mainly at DIP joints

• Both median and ulnar nerves

What muscle is on the left, where is it, and whats its action

Flexor pollicis longus

• Deep, thumb side of anterior forearm

• Flexes thumb especially at IP joint

What muscle is on the top right, where is it, and whats its action (+ nerve)

Extensor carpi radialis longus

• Superficial, thumb side of posterior forearm

• Extends wrist and moves it toward thumb

• Radial nerve

What muscle is on the top left, where is it, and whats its action (+ nerve)

Extensor carpi ulnaris

• Superficial, pinky side of posterior forearm

• Extends wrist and moves it toward pinky

• Deep Radial nerve

What muscle is on the bottom left, where is it, and whats its action

Extensor digiti minimi

• Superficial, posterior forearm near pinky side

• Extends pinky finger

What muscle is on the middle right, where is it, and whats its action

Extensor carpi radialis brevis

• Superficial, thumb side of posterior forearm

• Extends wrist and moves it toward thumb

What muscle is on the bottom right, where is it, and whats its action

Extensor digitorum

• Superficial, middle of posterior forearm

• Extends fingers 2-5

What muscle is on the top right, where is it, and whats its action

Abductor pollicis longus

• Deep, posterior forearm, thumb side

• Abducts thumb

What muscle is on the top left, where is it, and whats its action

Extensor pollicis longus

• Deep, posterior forearm

• Extends thumb, especially at IP joint

What muscle is on the bottom right, where is it, and whats its action

Extensor pollicis brevis

• Deep, posterior forearm, thumb side

• Extends thumb, especially MCP joint

What muscle is on the bottom left, where is it, and whats its action

Extensor indicis

• Deep, Posterior forearm

• Extends index finger

Fingers mostly innervated by what nerves

• Median/Ulnar Nerve

• NO innervation from radial nerve

Thenar moves what and is innervated by what

• Thenar = move the thumb

• All are Pollicis (pollex = thumb)

• Mostly intervated by Median nerve

Hypothenar moves what and is innervated by what

• Hypothenar = move the pinky

• All are digiti minimi

• All innervated by Ulnar nerve

What muscle is between the metacarpal bones of hand (palmar side)

Palmar interossei

• Adduct fingers (bring them together)

• Innervated by Ulnar nerve

PAD: Palmar interossei = ADduction

What muscle is between the metacarpal bones of hand (dorsal side)

Dorsal interossei

• Abduct fingers (spread apart)

• Innervated by Ulnar nerve

DAB: Dorsal interossei = ABduction

What is the location, action, and innervated by what nerves for the lumbricals

• Palm of the hand, along the flexor tendons

• Flex MCP joints and extend PIP/DIP joints

• Median and Ulnar

Carpal Tunnel syndrome

a medical condition that happens when swelling or pressure squeezes the median nerve inside the rigid passageway made of bones and a tough ligament

Tennis elbow

inflammation of the lateral side of elbow