Download MBBS (Bachelor of Medicine, Bachelor of Surgery) Human Anatomy ppt lectures Topic 9 Arm Cubital Fossa Output Notes. - anatomy ppt free download human anatomy ppt lectures, medicine notes ppt, anatomy handwritten notes pdf, mbbs 1st year anatomy notes pdf download, best anatomy notes pdf, human anatomy notes pdf, anatomy easy notes pdf, anatomy notes online, anatomy short notes, Anatomy ppt, Powerpoint Presentations and lecture notes.
Learning Objectives
? At end of this session, students should be able to:
? DESCRIBE
? Attachments, actions & innervations of - biceps
brachii, coracobrachialis, brachialis, triceps
brachii
? Contents of ant & post compartment of arm ,
their anatomical Relations and clinical
importance
? Boundaries of cubital fossa and its contents.
Medial Intermuscular Septum
?From subcutaneous sheath to humerus.
?Separates muscles of anterior arm from medial
side of triceps complex.
?Lateral Intermuscular Septum
?From subcutaneous sheath to humerus.
?Separates muscles of anterior arm from lateral
side of triceps complex.
Anterior Brachial
Compartment
BBC ? Musculocutaneous nerve
Muscles
?Components:
Biceps brachii
Coracobrachialis
Brachialis
?Function:
Forearm flexors
Biceps also supinates forearm
Innervation
?Musculocutaneous nerve C5-6
?Nerves passing through compartment - But
not innervating anterior compartment
structures are : Median & Ulnar nerve
Through proximal part of anterior
compartment.
?Blood supply ?
?Brachial artery
?Basilic vein and venae comitantes
Posterior compartment
Triceps & anconeus ?
Radial Nerve
Muscles
?Components:
?Triceps brachii.
?Anconeus.
?Function:
?Forearm extensors.
?Long head of triceps can extend shoulder
(arm).
?Synergists in forearm supination.
?Innervation/Vascularization
?Radial nerve C7
?Deep brachial artery
Nerves and Vessels in Arm
Median Nerve
?Supplies flexor muscles on radial side of
forearm.
?Travels with brachial artery:
?upper half - Lateral to brachial artery.
?lower half - Medial to brachial artery .
?Crosses cubital fossa superficially:
?With brachial artery &
?Deep to bicipital aponeurosis
Ulnar Nerve
?Supplies flexor muscles on ulnar side of forearm.
?Starts in anterior brachial compartment - MC
?Medial to brachial artery
?Runs with superior ulnar collateral artery.
?Pierces medial intermuscular septum:
?Enters posterior compartment of arm.
?Passes around (superficial) posterior to medial
epicondyle.
?Passes into forearm between two heads of flexor
carpi ulnaris muscle.
Radial Nerve - PC
?Supplies extensor muscles in posterior
compartment of brachium as well as extensor
muscles of wrist and hand.
?Also supplies brachioradialis muscle- Propioceptive
?Descends posterior to axillary artery:
?Spirals around the posterior surface of humerus in
spiral (radial) groove.
?Accompanied with Profunda brachial artery.
Radial Nerve
?Pierces lateral intermuscular septum distal to
deltoid insertion ? enters into anterior
compartment.
?Passes into forearm:
?Between the brachialis medially and
brachioradialis laterally.
?Divides into superficial and deep branches
near lateral epicondyle.
Radial Nerve
?Branches in the axilla and upper third of arm:
Muscular branch to long head of triceps.
Muscular branch to medial head of
triceps.
Posterior cutaneous nerve of arm.
Radial Nerve
?Branches in radial groove in middle third
of arm:
?Branch to lateral head , medial head of
triceps and anconeus.
?Lower lateral cutaneous nerve of arm.
?Posterior cutaneous nerve of forearm.
Arm
Bone of Arm Humerus
Shoulder
M
R
A
Anterior
Posterior
view
view
Elbow
lateral & medial intermuscular septa divide distal part
of arm into:
? Anterior &
? Posterior compartments
Anterior Compartment: Contents
Anterior Compartment: Contents
?Muscles: Biceps brachii,
Coracobrachialis, Brachialis
?Blood Vessels: Brachial artery, Basilic
vein
?Nerves : Musculocutaneous, Median,
Ulner & Radial
Muscles of the Anterior Compartment
Coracobrachialis
Biceps brachii
Brachialis
Biceps Brachii
?Origin: Two heads:
Coracoid
? Long head from
process
supraglenoid
tubercle of
scapula
(intracapsular)
? Short head from
the tip of
coronoid process
of scapula
? Two heads join in
the middle of the
arm
? Insertion:
Biceps brachii
? posterior part of radial
Tendon
tuberosity, &
inserted
?
to radial
deep fascia of medial
tuberosity
aspect of forearm
through - bicipital
aponeurosis
? N/S : Musculocutaneous
? Action:
Bicipital
?
aponeurosis
Strong supinator of the
forearm (used in
screwing)
? Powerful flexor of elbow
? Weak flexor of shoulder
Coracobrachialis
?Origin: Tip of coracoid
process
?Insertion: Middle of
medial side of shaft of
humerus
?Nerve supply:
Musculocutaneous
?Action: Flexor & a weak
adductor of the arm
Brachialis
?Origin: front of
lower half of
humerus
?Insertion: anterior
surface of coronoid
process of ulna
?Nerve supply:
Musculocutaneous
& Radial
?Action: Strong
flexor of the
forearm
Posterior Compartment: Contents
?Muscles:
Triceps
?Vessels:
Profunda
brachii &
Ulnar
collateral
arteries
?Nerves:
?Radial & Ulnar
Muscle of Posterior Compartment
?Triceps brachii
Triceps
?Origin:
?Three heads
Long head - infrglenoid
tubercle of scapula
Lateral head from upper
half of posterior surface
of shaft of humerus
above spiral groove
Medial head from lower
half of posterior surface
of shaft of humerus
below spiral groove
?Insertion: Common
tendon inserted into the
upper surface of the
olecranon process of
ulna
?Nerve supply: Radial
nerve
?Action: Strong extensor
of the elbow joint
Radial Nerve
?Branches in distal third of arm:
? brachioradialis.
? extensor carpi radialis longus &
brevis?
? Articular branches to elbow joint.
Musculocutaneous Nerve
?Pierces coracobrachialis in upper half or third of
brachium.
?Innervates muscles of anterior brachial
compartment.
?Pierces fascia lateral to biceps tendon:
?Continues as lateral cutaneous nerve of
forearm.
?Supplies skin on lateral forearm as far as wrist.
Nerves in arm
?Medial cutaneous nerve of arm :
Direct branch from medial cord.
?Medial cutaneous nerve of forearm:
Direct branch from medial cord.
Cephalic Vein
?Lateral continuation of dorsal venous
arch.
?Ascends in superficial fascia along lateral
aspect of forearm and arm.
?Passes through deltopectoral triangle.
?Empties into axillary vein.
Basilic Vein
?Medial continuation of dorsal venous arch.
?Ascends in superficial fascia along lateral
aspect of forearm and arm to middle of arm.
?Pierces deep fascia and ascends in upper
aspect of arm in deep fascia.
?Joins venae comitantes to form axillary vein:
?Usually near inferior border of teres major.
Median Cubital Vein
?Connects cephalic and basilic vein.
?Extends diagonally across bicipital
aponeurosis.
?Receives blood from median
antebrachial vein.
?Drains blood from palmar hand.
Venae Comitantes
?Veins that parallel arteries:
?Usually two per artery.
?Countercurrent heat exchange.
Brachial Artery
?Direct continuation of axillary artery.
?Begins at inferior border of teres major.
?Main branch is deep brachial artery.
?Other branches:
Superior ulnar collateral:
To posterior ulnar recurrent.
Inferior ulnar collateral:
To anterior ulnar collateral.
Relationships
?Radial nerve to deep brachial artery in
radial (spiral groove).
?Brachial artery to median nerve.
?Brachial artery to bicipital aponeurosis.
?Superior ulnar collateral artery to medial
epicondyle.
Relationships
?Ulnar nerve to medial epicondyle.
?Musculocutaneous nerve to
coracobrachialis muscle.
?Musculocutaneous nerve to biceps and
brachialis muscles.
?Lateral cutaneous nerve of the forearm
to the bicipital tendon.
CUBITAL FOSSA
Cubital fossa
A triangular space in front of elbow joint.
Boundaries:
?Base: an imaginary line between 2
epicondyles of humerus
?Laterally: medial border of brachioradialis
?Medially: lateral border of pronator teres
?Apex: brachioradialis overlaps pronator teres
Cubital Fossa Boundaries
? Lateral:
Brachioradialis muscle
? Medial:
Pronator teres muscle
? Superior base:
Line between two humeral epicondyles
? Floor:
Supinator and brachialis muscles
Cubital fossa (boundaries)
Cubital fossa
Roof:
?Skin
?Superficial fascia containing: cephalic vein, lateral
cutaneous nerve of forearm, basilic vein, medial
cutaneous nerve of forearm & medial cubital vein
?Deep fascia
?Bicipital aponeurosis
Floor:
1.
Brachialis (medially)
2.
Supinator (laterally)
Cubital fossa (roof)
Cubital fossa
? CONTENTS:
From lateral to medial:
?Radial nerve & its deep branch
?Tendon of biceps brachii
?Termination of brachial artery & beginning of radial
& ulnar arteries
?Median nerve
Cubital fossa (contents)
Cubital Fossa Contents
? Lateral to medial:
Biceps
Tendon
Brachial Artery
Median Nerve
Cubital Fossa
is a triangular depression on
anterior aspect of the
elbow
Boundaries
?Base: line drawn through two
epicondyles of humerus
?Laterally: brachioradialis
?Medially: pronator teres
?Roof: skin, superficial, deep
fascia and bicipital
aponeurosis
?Floor: brachialis medially and
supinator laterally.
Contents of the Cubital Fossa
(From medial to lateral side)
This post was last modified on 05 April 2022