Arm and Elbow

Question 1

Biceps Brachii

Attachments, Action, Innervation

Answer 1

Short Head: Coracoid Process

Long Head: Supraglenoid Tubercle

Insertion: Radial Tuberosity, Deep Fascia of Forearm via Bicipital Aponeurosis

Flex + Supinate Forearm

Short Head: Resists Shoulder Dislocation

Nerve Supply: Musculocutaneous Nerve (C5,C6,C7)

Question 2

Brachialis

Attachments, Action, Innervation

Answer 2

Origin: Distal 1/2 of Anterior Surface Humerus

Insertion: Coronoid Process and Tuberosity of Ulna

Action: Flexion of Forearm in all Positions

Nerve Supply: Musculocutaneous Nerve (C5,C6)

Question 3

Coracobrachialis

Attachments, Action, Innervation

Answer 3

Origin: Coracoid Process

Insertion: Middle 3rd of Medial Humerus

Adduct + Flex Humerus, Resist Shoulder Dislocation

Nerve Supply: Musculocutaneous Nerve (C5,C6,C7)

Question 4

Triceps Brachii

Attachments, Action, Innervation

Answer 4

Long Head: Infraglenoid Tubercle

Med. Head: Post. Surface Humerus Inferior to Radial Groove

Lat. Head: Post. Surface Humerus Superior to Radial Groove

Insertion: Proximal Surface of Olecranon + Fascia of Forearm

Action: Extension of Forearm

Long Head: May Extend + Adduct Humerus

Nerve Supply: Radial Nerve (C6, C7, C8)

Question 5

Humeroulnar Joint

(Consists of, Type, Action)

Answer 5

Trochlea of Humerus, Trochlea Notch of Ulna

Type: Compound Synovial

Action: Act Together as Hinge Joint (w/ Humeroradial Joint) Permits Flexion and Extension

Question 6

Humeroradial Joint

(Consists of, Type, Action)

Answer 6

Capitulum of Humerus, Proximal Surface of Head of Radius

Type: Compound Synovial Joint

Action: Act as Hinge w/ Humeroulnar Jt. > Flex/Extend

Act as Pivot Joint w/ Proximal/Distal Radioulnar Jts. >

Supination/Pronation

Question 7

Proximal Radioulnar Joint

(Consists of, Type, Action)

Answer 7

Circumference of Head of Radius + Radial Notch of Ulna

Type: Compound Synovial Joint

Action: Act as Pivot Joint w/ Proximal/Distal Radioulnar Jts.

Question 8

Distal Radioulnar Joint

(Consists of, Type, Action)

Answer 8

Head of Ulna and Ulnar Notch of Radius

Type: Synovial Pivot Joint

Action: Acts as a Pivot Joint w/ Humeroradial and Distal Radioulnar Jts. > Supination/Pronation

Note: Triangular Articular Disc Seperates Radiocarpal Joint from Head of Ulnar

Question 9

Radial Collateral Ligament

Attachments

Answer 9

Lateral Epicondyle >

Olecranon + Annular Ligament

Question 10

Ulnar Collateral Ligament

Attachments

Answer 10

Medial Epicondyle >

Olecranon + Coronoid Process

Question 11

Annular Ligament

Attachments

Answer 11

Ant. Margin of Radial Notch >

Post. Margin of Radial Notch