L:4 Forearm and Elbow

Question 1

Elbow Joint Articulations

Answer 1

(1) the trochlear notch of the ulna with the trochlea of the humerus and

(2) the head of the radius with the capitulum of the humerus.

Question 2

Radius

Answer 2

– identify medial + lateral aspects and how it articulates with ulna.
-head of radius, neck of radius, articular circumference, radial tuberosity, ulnar notch, styloid process, articular surface.

Question 3

Ulna

Answer 3

examine this bone and know how to orient yourself according to major landmarks.
- olecranon, trochlear notch, radial notch, coronoid process, ulnar tuberosity, head of ulna, articular circumference
styloid process.

Question 4

Elbow Joints:

Humeroulnar

Answer 4

Question 5

Superior Radioulnar

Answer 5

Question 6

Humeroradial

Answer 6

Question 7

Superficial layer

Flexors of the Forearm

4

Answer 7

Flexor Carpi Radialis (M),
Pronator Teres, (M)
Palmaris Longus (M)
Flexor Carpi Ulnaris (U)

Question 8

Intermediate layer

Flexors of the Forearm

1

Answer 8

Flexor Digitorum Superficialis (M)

Question 9

Deep layer

Flexors of the Forearm

3

Answer 9

Flexor Pollicis Longus, (M)
Pronator Quadratus (M),
Flexor Digitorum Profundus (U + M)

Question 10

Superficial layer

Extensors of the Forearm

6

Answer 10

Extensor Carpi Radialis Longus (R),
Extensor Carpi Radialis Brevis (R),
Extensor Carpi Ulnaris (R),
Extensor Digitorum (R),
Extensor Digiti Minimi (R),
Brachioradialis. (R)

Question 11

Deep Layer

Extensors of the Forearm

5

Answer 11

Supinator, (R)
Extensor Indicis (R),
Abductor Pollicis Longus (R),
Extensor Pollicis Longus (R)
Extensor Pollicis Brevis (R),

Question 12

Describe the points of articulation among the proximal ends of the ulna and radius and the distal end of the
humerus.

Answer 12

description

Question 13

Where do most of the muscles of the forearm attach? Discuss this for both the flexor and extensor groups.

Answer 13

Flexors: Medial Epicondyle of Humerus
Extensors: Lateral Epicondyle of Humerus

Question 14

For each movement, name the agonist and antagonist muscle(s)

Elbow Flexion

Answer 14

• Agonist (Prime Mover): Biceps brachii
• Synergists: Brachialis, brachioradialis
• Antagonists: Triceps brachii

Question 15

For each movement, name the agonist and antagonist muscle(s)

Elbow Extension

Answer 15

• Agonist (Prime Mover): Triceps brachii
• Synergists: Anconeus
• Antagonist: Biceps brachii

Question 16

For each movement, name the agonist and antagonist muscle(s)

Pronation

Answer 16

• Agonist (Prime Mover): Pronator teres, pronator quadratus
  
  • Synergist: None specified (these muscles primarily act as pronators)
  • Antagonist: Supinator (antagonistic action, as it opposes pronation)

Question 17

For each movement, name the agonist and antagonist muscle(s)

Supination

Answer 17

• Agonist (Prime Mover): Biceps brachii (short head), supinator
  
  • Synergist: Brachialis
  • Antagonist: Pronator teres, pronator quadratus

Question 18

Supinator

Answer 18

O: Lateral epicondyle of humerus
I: Lateral, posterior, and anterior surfaces of radius
F: Supinates
N: Radial Nerve

Question 19

Which Forearm Flexors do NOT originate on the medial epicondyle of the Humerus?

Answer 19

Flexor Pollicis Longus
Flexor Digitorum Profundus
Brachialis

Question 20

Which Muscle Attaches to the Pisiform?

Answer 20

Flexor Carpi Ulnaris

Question 21

What Muscle Originates from the Trapezium? What Muscle Attaches to the Trapezium? What do they do?
Nerve Supply?

Answer 21

Originates
Flexor Pollicis Brevis
Flexes the thumb at the Metacarpophalangeal Joint.
Median Nerve

Attaches
Abductor Pollicis Longus
Abducts and extends the thumb at the carpometacarpal joint.
Radial Nerve

Question 22

Which Muscles are Responsible for Radial Deviation?

Answer 22

Extensor Carpi Radialis Longus,
Extensor Carpi Radialis Brevis,
Flexor Carpi Radialis,

Question 23

Which Muscles are Responsible for Ulnar Deviation?

Answer 23

Flexor Carpi Ulnaris
Extensor Carpi Ulnaris

Question 24

What Muscles Originate from the Lateral Epicondyle of the Humerus?

five

Answer 24

Extensor Carpi Radialis Brevis
Extensor Carpi Radialis Longus
Extensor Carpi Ulnaris
Extensor Digiti Minimi
Extensor Digitorum

Question 25

What Muscle **Opposes** the Thumb?

Answer 25

Opponens Pollicis (M) opposes the thumb, allowing it to move toward and touch the other fingers, aiding in fine motor movements and precision grip.

Question 26

What Muscle **Abducts** the Thumb?

Answer 26

Abductor Pollicis Brevis (M) abducting the thumb, moving it away from the palm.

Question 27

What Muscle Originates from the Hook of Hamate?

Answer 27

Opponens Digiti Minimi (U) opposes the little finger (digitus minimus), allowing it to touch the thumb and aiding in fine motor movements.

Question 28

Which Flexor has Two Innervations?

Answer 28

Flexor Digitorum Profundus Innervated by the median nerve (lateral) and the ulnar nerve (medial)

Question 29

Which Thumb Muscles are NOT supplied by the radial nerve?

Answer 29

Opponens Pollicis (M) Abductor Pollicis Brevis (M)