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Gross Anatomy
Lecture 10
22
Anatomy
Graduate
02/27/2010

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Term
Posterior Compartment of Arm
Definition
  • Triceps Brachii
  • Anconeous

 

innervation: radial nerve C5-T1

Term
Triceps Brachii
Definition

attachments: infraglenoid tubercle of scapula (long head), back of humerus above (lateral head) and below (medial head) radial groove to olecranon process of ulna

 

actions: extension of forearm at elbow

 

innervation: radial nerve C5-T1

Term
anconeous
Definition

attachments: lateral epicondyle of humerus to posterolateral surface of olecranon process of ulna

 

actions: extension of forearm at elbow

 

innervation: radial nerve C5-T1

Term
Muscles of Posterior Compartment of Forearm
Definition
  • 3 wrist extensors: Extensor Carpi Radialis Brevis, Extensor Carpi Radialis Longus, Extensor Carpi Ulnaris
  •  

  • 3 digital extensors: Extensor Digitorum, Extensor Digitimini, Extensor Indicis
  •  

  • 3 thumb extensors: Thenar Outcrop Muscles
  •  

  • brachioradialis
  • supinator
  • Term
    Extensor Carpi Radialis Longus
    Definition

    attachments: lateral supracondyle ridge of humerus (inferior to brachioradialis) to base of second metacarpal

     

    actions:

    • extension of hand at wrist
    • ABduction of hand

    innervation: radial nerve C5-C7

     

    Term
    All of the following muscles attach to lateral epicondyle of humerus via common extensor tendon (c.e.t.) and innervated by DEEP branch of radial nerve C7-C8
    Definition
    • Extensor Carpi Radialis Brevis
    • Extensor Digitorum
    • Extensor Digiti Minimi
    • Extensor Carpi Ulnaris
    • Extensor Indicis

     

    Thenar Outcrop Muscles

    • ABductor Pollicis Longus
    • Extensor Pollicis Brevis
    • Extensor Pollicis Longus
    Term
    Extensor Carpi Radialis Brevis
    Definition

    attachment c.e.t. to base of third metacarpel of hand

     

    actions: extension of hand at wrist, ABduction of hand

    Term
    Extensor Digitorum
    Definition

    attachment: c.e.t. to extensor expansion of digits 2-5

     

    actions: extension of fingers at MCP, PIP, DIP

     

    Term
    Extensor Digiti minimi
    Definition

    accessory slip of extensor digitorum

     

    attachment: c.e.t. to extensor expansion of digit 5

     

    actions: extension of little finger at MCP, PIP & DIP joints

    Term
    Extensor Carpi Ulnaris
    Definition

    attachments: c.e.t. & posterior surface of ulna to base of metacarpel 5

     

    actions:

    • extension of hand at wrist
    • ADDuction of hand (f.c.u.)

     

     

    Term
    Extensor Indicis (index finger)
    Definition

    attachments: posterior surface of ulna & interosseous membrance to extensor expansion of digit 2

     

    actions: extension of index finger at MCP, PIP & DIP joints

    Term
    Supinator
    Definition

    attachments: lateral olecranon, lateral epicondyle & ligaments of elbow joint to posterior & lateral surface of proximal third of radius

     

    actions: supination

     

    innervations: deep branch of radial nerve C7-C8

    Term
    "Thenar Outcrop" muscles
    Definition
    • ABductor Pollicis Longus
    • Extensor Pollicis Brevis
    • Extensor Pollicis Longus

    innervation: deep branch of radial nerve C7-C8

     

    These tendons bound to anatomical snuffbox.

    Within the snuffbox are the superficial branch of the radial nerve & radial artery, the scaphoid bone forms the floor

    Term
    ABductor Pollicis Longus
    Definition

    attachments: posterior surface of ulna, radius & interosseous membrane to base of first metacarpel

     

    actions: extension & ABduction of thumb

    Term
    Extensor Pollicis Brevis
    Definition

    attachments: posterior surface of radius & interosseous membrane to base of proximal phalanx of thumb

     

    actions: extension of carpmetacarpal & MCP joints of thumb

    Term
    Extensor Pollicis Longus
    Definition

    attachments: posterior surface of ulna & interosseous membrance to base distal phalanx of thumb

     

    actions: extension of MCP & IP of thumb

    Term
    Musculocutaneous Nerve C5-C7
    Definition

    From lateral cord of brachial plexus, pierces coracobrachialis to enter anterior compartment of arm

     

    supplies mm. of flexor compartment

     

    continuing onto forearm as lateral antebrachial cutaneous nerve

    Term
    Ulnar Nerve C8-TI
    Definition

    From medial cord of brachial plexus

     

    decends medial aspect of arm

     

    becoming superficial as it passes behind medial epicondyle ("funny bone") and enters anterior forearm

     

    supplies flexor carpi ulnaris & one half of flexor digitorum profundus in forearm and has extensive role in hand

     

    damage produces "claw hand"

    Term
    Medial brachial and antebrachial cutaneous C8-T1
    Definition

    from medial cord of brachial plexus

     

    supply medial skin of upper limb

    Term
    Median Nerve C5-T1
    Definition

    from lateral & medial cords of brachial plexus

     

    descends through cubital fossa to extensively supply anterior forearm mm. and also has extensive role in hand

     

    deep branch in anterior forearm is the anterior interosseous nerve

     

    passes through carpal tunnel

     

     

    Term
    Radial Nerve C5-T1
    Definition

    from posterior cord of brachial plexus

     

    passes along radial groove (spiral groove) of posterior humerus

     

    supplying mm. of posterior compartment

     

    passes laterally at elbow and splits at the lateral epicondyle into superficial and deep branches of radial nerve at edge of cubital fossa

    Term
    Posterior Interosseous Nerve C7-C8
    Definition

    supplies mm. of posterior forearm

     

    damage produces "wrist drop"

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