Slideshow: Ulna
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Transcript of Slideshow: Ulna
The Ulna
The Ulna
The Ulna is one of two bones in the forearm
The Ulna lies medially
The Ulna
The Radius lies laterally
The Ulna
The Ulna is a long bone
It is divided into
thirds along its
length
It is divided into
thirds along its
length
It is divided into
thirds along its
length
Proximal third
It is divided into
thirds along its
length
Proximal third
Middle third
It is divided into
thirds along its
length
Proximal third
Middle third
Distal Third
The Proximal Ulna is expanded and has a number of interesting projections
Medial view Lateral view
Right Ulna
Anterior View Posterior View
The Proximal Ulna is expanded and has a number of interesting projections
Right Ulna
Proximal Ulna
Lateral View
Radial Notch
The Ulna articulates with the Radial Head at the Proximal Radioulnar Joint
Right Ulna
The Ulna
Proximal Radio-Ulnar Joint
The Ulna articulates with the Radial Head at the Proximal Radioulnar Joint
The Ulna articulates with the Humerus at the Elbow Joint
Lateral View
Trochlear Notch
Right Ulna
Distal HumerusPosterior view
Trochlea
The Trochlear Notch of the Ulna articulates with the
Trochlea of the Humerus
This joint permits flexion and extension
Lateral View
Olecranon
The Triceps Muscle inserts here
Right Ulna
Distal HumerusPosterior view
Olecranon Fossa
In extension the Olecranon Process of the Ulna engages with the Olecranon Fossa of
the Distal Humerus
Medial View
Coronoid Process
Distal HumerusAnterior View
Coronoid Process
In Elbow Flexion the
Coronoid Process of the Ulna
articulates with the
Coronoid Fossa of the distal Humerus
In Elbow Flexion the
Coronoid Process of the Ulna
articulates with the
Coronoid Fossa of the distal Humerus
The distal end of the Ulna is much smaller than the proximal end
It helps form the wrist joint
The Ulna articulates at both ends with the Radius
Proximal Radio-Ulnar Joint
Distal Radio-Ulnar Joint
The Distal Ulna has a
Rounded Head
The Distal Ulna has a
Rounded Head
and a small
Styloid Process
Muscles attaching to the Ulna
Proximal UlnaVolar Aspect
Flexor Digitorum SuperficialisUlnar Head
Pronator Teres
Proximal UlnaVolar Aspect
The Ulnar head attaches to the
medial border of the Coronoid Process
Pronates the forearm and flexes the elbow
Volar Aspect Forearm
Brachialis
Volar Aspect ForearmAttaches to
Coronoid Process and Tuberosity of the
Ulna
Flexes Elbow
Brachialis
Supinator
Proximal UlnaLateral View
Posterior View Forearm
Supinator
Deep part attaches to the supinator crest and ulna
tuberosity
Supinates the forearm
Proximal UlnaLateral View
Posterior View Forearm
Proximal UlnaLateral View
Supinator Crest
Ulna Tuberosity
Flexor Digitorum Profundus
Volar Aspect Forearm
Flexor Digitorum Profundus
Arises from the medial aspect of olecranon and
proximal 3/4 of medial and anterior surfaces of ulna
Flexes distal interphalangeal joints,
proximal interphalangeal joints,
metacarpophalangeal joint of digits 2-5; flexes wrist
Volar Aspect Forearm
Pronator Quadratus
Volar Aspect Forearm
Pronator Quadratus
Volar Aspect Forearm
Distal 1/4 of anterior surface of ulna
Pronates forearm
Triceps
Triceps
Attaches to olecranon process of ulna
Extends elbow joint
Anconeus
Anconeus
Attaches to postero-lateral aspect of
olecranon process of the ulna
Extends the elbow joint, abducts ulna in
pronation
Flexor Digitorum Profundus
Posterior View
Anterior View
Flexor Digitorum Profundus
Posterior View
Anterior View
Arises from medial olecranon, proximal 3/4 of medial and anterior surfaces of ulna
Flexes distal interphalangeal, proximal interphalangeal,
metacarpophalangeal joints of digits 2-5; flexes wrist
Aponeurotic attachment of
Flexor Digitorum ProfundusFlexor Carpi UlnarisExtensor Carpi Ulnaris
Dorsal aspect of right forearm
Abductor Pollicis Longus
Abductor Pollicis Longus
Arises from posterior surface of proximal
shaft of ulna
Abducts thumb, extends thumb at
carpometacarpal joint
Extensor Pollicis Longus
Extensor Pollicis Longus
Posterior surface of middle 1/3 of ulna
Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
Extensor Indicis
Extensor Indicis
Distal aspect posterior surface of ulna
Extends index finger and hand
Abductor Pollicis Longus
Anconeus
Brachialis
Extensor Carpi Ulnaris
Extensor Indicis
Extensor Pollicis Longus
Flexor Carpi Ulnaris
Flexor Digitorum Profundus
Flexor Digitorum Superficialis
Pronator Quadratus
Pronator Teres
Supinator
Triceps
Summary of Muscles attaching to the Ulna
Posterior Forearm
Abductor Pollicis LongusOrigin Posterior surfaces of proximal
shaft of ulna and middle third radius and intervening interosseous membrane
Insertion Dorsal aspect base of 1st metacarpal, trapezium
Action Abducts thumb, extends thumb at carpometacarpal joint
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
AnconeusOrigin Distal and posterior aspect
lateral epicondyle of humerusInsertion Postero-lateral aspect olecranon
process of the ulnaAction Extends the elbow joint, abducts
ulna in pronationNerve Supply Posterior interosseous nerve
(deep branch radial nerve C7, C8)Blood Supply Posterior interosseous artery
Anterior ArmBrachialis
Origin Distal half of anterior surface of humerus
Insertion Coronoid process and tuberosity of ulna
Action Flexes elbowNerve Supply Musculocutaneous nerve (C5,
C6) Blood Supply Muscular branches of brachial
artery, recurrent radial artery
Posterior Forearm
Extensor Carpi UlnarisOrigin Common extensor origin on
anterior aspect lateral epicondyle of humerus
Insertion Base of 5th metacarpal via groove in ulnar styloid
Action Extends and adducts hand at wrist joint
Nerve Supply Posterior interosseous nerve, (deep branch of radial nerve C7, C8)
Blood Supply Ulnar artery
Posterior Forearm
Extensor IndicisOrigin Distal aspect posterior surface
of ulna and interosseous membrane
Insertion Extensor expansion of index finger
Action Extends index finger and handNerve Supply Posterior interosseous nerve
(deep branch radial nerve C7, C8)
Blood Supply Posterior interosseous artery
Posterior Forearm
Extensor Pollicis LongusOrigin Posterior surface of middle 1/3
of ulna and interosseous membrane
Insertion Base of distal phalanx of thumb
Action Extends distal phalanx of thumb at carpometacarpal and interphalangeal joints
Nerve Supply Posterior interosseous nerve (deep branch of radial nerve C7, C8)
Blood Supply Posterior interosseous artery
Anterior Forearm
Flexor Carpi UlnarisOrigin Humeral head: common flexor
origin, medial epicondyle of humerusUlnar head: olecranon and upper 2/3rds posterior border of ulna
Insertion Pisiform, hook of hamate, 5th metacarpal
Action Flexes and adducts hand (at wrist)
Nerve Supply Ulnar nerve (C7 and C8)Blood Supply Ulnar artery
Anterior Forearm
Flexor Digitorum ProfundusOrigin Medial olecranon, proximal 3/4 of
medial and anterior surfaces of ulna and interosseous membrane
Insertion Base of the distal phalanx of digits 2 - 5
Action Flexes distal interphalangeal joints, proximal interphalangeal joints, metacarpophalangeal joint of digits 2-5; flexes wrist
Nerve Supply Medial part: ulnar nerveLateral part: anterior interosseous branch of median nerve (C8 and T1)
Blood Supply Ulnar and anterior interosseous arteries
Anterior ForearmFlexor Digitorum Superficilais
Origin Humeral head: common flexor origin, medial epicondyle of humerusUlnar head: ulnar collateral ligament, and coronoid process of ulnaRadial head: superior half of anterior border of radius, anterior oblique line
Insertion Tendons split and insert of either side of middle phalanges digits 2 –5
Action Flexes middle phalanges at proximal interphalangeal joints of 2-5 digits; flexes proximal phalanges at metacarpophalangeal joints and hand
Nerve Supply Median nerve (C7, C8 and T1)Blood Supply Ulnar artery
Pronator QuadratusOrigin Distal 1/4 of anterior surface
of ulnaInsertion Distal 1/4 of anterior surface
of radiusAction Pronates forearmNerve Supply Anterior interosseous nerve
from median nerve (C8 and T1Blood Supply Anterior interosseous artery
Anterior Forearm
Anterior Forearm
Pronator TeresOrigin Humeral head: medial
epicondyle, supracondylar ridge of humerusUlnar head: medial border coronoid process of ulna
Insertion Middle of lateral surface of radius
Action Pronates forearm, flexes elbowNerve Supply Median nerve (C6 and C7)Blood Supply Ulnar artery, anterior recurrent
ulnar artery
Posterior ForearmSupinator
Origin Superficial part (downwards): Lateral epicondyle of humerus, radial collateral and annular ligamentsDeep part (horizontal): supinator fossa and crest of ulna
Insertion Lateral, posterior and anterior surfaces of proximal 1/3 of radius
Action Supinates forearm Nerve Supply Posterior Interosseous nerve
(C5 and C6) Blood Supply Recurrent interosseous artery
TricepsOrigin Long head: infraglenoid
tubercle of scapula; Lateral head: posterior surface of humerus, superior to radial grooveMedial head: posterior surface of humerus, inferior to radial groove
Insertion Olecranon process of ulna, fascia of forearm
Action Extends elbow jointNerve Supply Radial nerve (C6, C7 and C8) Blood Supply Branches of deep brachial
artery
Posterior Arm