Lecture Exam 2 - Anterior Forearm Compartment

Styloid Process of the Radius

Styloid Process of the Ulna

Distal Radius (Colles) Fracture

Carpals

Metacarpals

Phalanges

Digit 1: Pollex

Hamate

Pisiform

Triquetrum

Lunate

Trapezium

Trapezoid

Capitate

Scaphoid

avascular necrosis

poor vascularization of the proximal part of the Scaphoid Bone can cause this

Triangular Fibrocartilage Complex

separates the Ulna from the Radius ,Triquetrum and Lunate Bones

acts as stabilizer of the wrist joint, provides a smooth surface between the Ulna and Radius during pronation and supination, and acts as a shock absorber. 

The "Funny Bone"

Ulnar Nerve is posterior to the Medial Epicondyle of the Humerus and is vulnerable to trauma.

Interosseous Membrane

Palmar Aponeurosis

Wrist Extension

Wrist Flexion

Pronator Teres

Flexor Carpi Radialis

Palmaris Longus

Flexor Carpi Ulnaris

Pronator Teres, Flexor Carpi Radialis, Palmaris Longus, Flexor Carpi Ulnaris

Anterior Forearm Compartment: 1st Layer

Flexor Digitorum Superficialis

Anterior Forearm Compartment: 2nd Layer

Flexor Pollicis Longus, Flexor Digitorum Profundus

Anterior Forearm Compartment: 3rd Layer

Pronator Quadratus

Anterior Forearm Compartment: 4th Layer

Epicondyle of Humerus

Anterior Forearm Compartment: First Layer Orgins

Radius

Insertion of Pronator Teres Muscle

Pronation of the Forarm

Action of Pronator Teres Muscle

Anterior side of Base of 2nd Metacarpal Bone

Insertion of Flexor Carpi Radialis Muscle

Wrist flexion and abduction

Action of Flexor Carpi Radialis Muscle

Palmar Aponeurosis

Insertion of Palmaris Longus Muscle

Wrist flexion

Action of Palmaris Longus Muscle

Pisiform, Hook of Hamate, Anterior side of Base of 5th Metacarpal

Insertion of Flexor Carpi Ulnaris Muscle

Wrist flexion and adduction

Action of Flexor Carpi Ulnaris Muscle

Median Nerve

Nerves of most of the Anterior Forearm Muscles: First Layer

Ulnar Nerve

Nerve of Flexor Carpi Ulnaris Muscle

C8

Myotome of Anterior Forearm Muscles: First Layer

The Cubital Fossa

Median Cubital Vein

Superficial in the Cubital fossa

Medial Antebrachial Cutaneous Nerve

Innervates skin ulnar side of forearm

Lateral Antebrachial Cutaneous Nerve

Innervates skin radial side of forearm

Bicipital Aponeurosis

Specialization of the Brachial Fascia that provides protection for underlying structures in cubital fossa

biceps tendon, brachial artery, median nerve

Medial to lateral deep in cubital fossa

Distal Interphalangeal Joint (DIP Joint)

Proximal Interphalangeal Joint (PIP Joint)

Metacarpophalangeal Joint (MCP Joint)

Flexor Digitorum Superficialis Muscle

Common Flexor Tendon

Origin of Flexor Digitorum Superficialis Muscle

Middle Phalanges of Digits 2-5

Insertion of Digitorum Superficialis Muscle

Flexes digits 2-5

Action of Digitorum Superficialis Muscle

Median Nerve

Nerve of Digitorum Superficialis Muscle

Abduction of Thumb

Adduction of Thumb

Extension of Thumb

Flexion of Thumb

Flexor Pollicis Longus

Flexor Digitorum Profundus

Distal Phalanx of Digit 1

Insertion of Flexor Pollicis Longus Muscle

Flexes Pollex at Interphalangeal and Metacarpophalangeal joints

Action of Flexor Pollicis Longus Muscle

Distal Phalanges of Digits 2-5

Insertion of Flexor Digitorum Profundus Muscle

Flexes Digits 2-5 at Distal Interphalangeal Joints

Action of Flexor Digitorum Profundus Muscle

Anterior Interosseous Nerve

Nerve of most of anterior forearm Layers 3 and 4

Ulnar Nerve

Nerve of Flexor Digitorum Profundus Muscle (Ulnar half)

Pronator Quadratus

Ulna

Origin of Pronator Quadratus Muscle

Radius

Insertion of Pronator Quadratus Muscle

Pronation of the Forearm

Action of Pronator Quadratus Muscle

hypothenar eminence

Thenar Eminence

Palmar Fibromatosis (Dupuytren's Contracture)

Idiopathic progressive thickening and shortening of longitudinal bands of the Palmar Aponeurosis

Flexor Retinaculum (carpel tunnel)

Trigger Finger

Flexor tendon can’t flex all the way due to a nodule in the tendon not being able to move under tendon sheath in digit