AXILLA - bowenstaff.bowen.edu.ng
Transcript of AXILLA - bowenstaff.bowen.edu.ng
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AXILLA
LEYE OLABIYI
Anatomy Programme
Bowen University
Iwo
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OUTLINE
• INTRODUCTION
• BOUNDARIES
• CONTENTS
• APPLIED ANATOMY
• END
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INTRODUCTION
• 4-sided pyramidal space
– Lateral to the thoracic wall
– Inferior to the scapulo-humeral (Shoulder)
joint.
• Area of transition for structures to & fro the
upper limb
– Particularly for nerves and vessels.
• Colloquially referred to as the armpit.
• Important structures lie close together.
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BOUNDARIES
The axilla is bounded by:
• Four walls
– Anterior
– Posterior
– Medial
– Lateral
It also has
-An Apex
-A Base
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ANTERIOR WALL• Formed by Pectorales Ms.
– Pect major covers the whole wall
– Pect. Minor –the intermediate part• Enclosed in clavipectoral fascia
• Wider medially
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POSTERIOR WALL• Formed by more muscles
– Above• Subscapularis
– Below• Teres major
• Latissimus dorsi
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MEDIAL WALL• Formed by
– Ribs 1-4
– Intercoastal Mles in space 1-3
– Upper part of serratus anterior Mle
• Convex laterally
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LATERAL WALL• Formed by-
– Intertubercular groove of humerus
– @ the meeting of the Ant. & Post. Walls
• Quite narrow
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APEX• Corresponds to the interval between:
– Outer border of 1st rib- medially– Posterior surface of clavicle- anteriorly– Superior border of scapula -posteriorly
• Termed the Cervico-axillary canal
• Directed upwards into the root of the neck
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BASE• Formed by:
– Skin– Subcutaneous tissue– Axillary fascia
• Directed downwards• Broad medially, Narrow laterally• Convex upwards• Forms the concavity of the armpit.
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CONTENTS
◼ Vessels⚫ Axillary A. + Branches
⚫ Axillary V. + Tributaries
◼ Nerves⚫ Infraclavicular part of B. plexus +
Braches
◼ Lymph nodes/Vessels
◼ Muscles
◼ Fat
◼ Axillary Sheath
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AXILLARY ARTERY
• Continuation of the subclavian artery.
• Begins @ the lateral border of the first rib and ends at the lower boader of the teres major.
• Divided to 3 parts by the Pectoralis minor. – How?
• The first part has one branch,
– Superior thoracic artery, • course down the thoracic wall
• supply
– the first two intercostals spaces
– the highest parts of the serratus anterior.
•
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Cont’d…
• The second part has two branches:
– Thoracoacromial artery
• runs over the medial end of the pectoralis minor
• has four branches – Acromial
– Deltoid
– pectoral
– clavicular
– The lateral thoracic .
• Runs vertically along the surface of the serratus anterior.
• Supplies – Pectoralis muscles
– Serratus anterior
– Branches that supply the breast.
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CONTD
• The 3RD part has 3 branches.
– The subscapular.
• The largest of the branches
• Runs vertically on the anterior surface of the subscapularis.
• Supplies
– subscapularis, teres major, serratus anterior and latissimus dorsi
• Branches
– Circumflex scapular (supplies the dorsum of the scapula)
– Thoracodorsal (primarily supplies the latissimus dorsi).
– The 2nd and 3rd branches – Anterior circumflex humeral
– Posterior circumflex humeral. » They surround the surgical neck of the humerus.
» The posterior artery runs with the axillary nerve.
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Axillary Artery: divided
into three parts
Part 1 (proximal)
one branch
Part 2
(intermediate) two
branches.
Part 3 (distal) three
branches.
Subclavian A.
Brachial A.
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Axillary Artery: First Part
From lateral border of 1st rib to
medial border of Pectoralis Major
M.Named Branch:
Supreme Thoracic
A. (to external
thoracic body wall)
Supplies blood to
first and second
intercostal spaces
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Axillary Artery: Second part
Deep to the pectoralis minor M.
Thoracoacromial trunk
Branches to:
Clavicular area
Pectoralis region
Acromion of Scapula
Deltoid Muscle.
Lateral Thoracic Artery
Bbr. to Serratus Ant. M.
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Axillary Artery: third part
Lateral border of Pectoralis minor M. to
lateral border of Teres major M.
Subscapular A.:
Branches:
Circumflex scapular
A. (to multiple
muscles associated
with the scapula)
1.
Thoracodorsal A.
(to Latissimus
dorsi M.)
2.
Posterior circumflex
humeral A.
Anterior circumflex
humeral A.
How it will look in lab
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AXILLARY VEIN◼ Begins @ the lower border of the teres
major
◼ Anterior and medial to the Artery.
◼ Continuation of Brachial Vein
◼ Formed from the union of the brachial veins and the basilic vein.
◼ Ends at lateral border of 1st rib -the subclavian vein
◼ The cephalic vein enters the axillary vein close to its transition to subclavian vein
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NERVES• BRACHIAL PLEXUS
– DIVISIONS
• 3 post. 3 ant. @ the
apex.
– CORDS
• Related to 2nd part of
axillary A.
– BRANCHES
• Musculocutaneous
• Radial
• Medial
• Ulnar
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LYMPH NODES• Five principal groups.
– Apical, Pectoral (anterior), Humeral (lateral/brachial), Subscapular (posterior) and Central.
• The apical group• is found in the apex.
• Receives lymph from all other groups of axillary lymph nodes.
• The pectoral (anterior) nodes• lie along the medial wall
• Receive lymphatics from the lateral thoracic wall and lateral breast region.
• Drain to the central nodes and eventually to the apical group.
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Cont’d…• The humeral (lateral or brachial) nodes
• found in the lateral wall along the distal part of the axillary vein.
• Receive almost all of the lymph from the upper limb
• Drain to the central nodes.
– The subscapular (posterior) nodes• lie along the posterior axillary fold
• drain to the central nodes.
– The central nodes• located in the center of the axilla.
• Receive lymph from the pectoral, subscapular, and humeral groups of the axillary lymph nodes and then pass the collected lymph to the apical group of nodes.
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OTHERS
◼ MUSCLES
❑ Short head of biceps
❑ Subclavius
❑ Clavipectoral fascia
◼ FAT
❑ Nodes embedded in it.
◼ AXILLARY SHEATH
❑ Prolongation of the prevertebral layer of cervical fascia
❑ Covers Axillary A, Cords of B. plexus.
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APPLIED ANATOMY
• Aneurysm of the Axillary Artery– This can result in compression of the trunks of the brachial plexus,
causing pain and loss of feeling or sensation (anesthesia) in the area supplied by the affected nerves.
• Injuries to the Axillary Vein– The axillary vein is large and is in an exposed position.
– This makes it susceptible to injury when the axilla is injured.
• Enlargement of the Axillary Nodes– When infections of the upper limb occur, the axillary lymph nodes
can become tender.
– Enlargement of the apical group of nodes may obstruct the cephalic vein superior to the pectoralis minor.
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Cont’d….• Axillary Lymph Node Dissection
– The excision and pathologic analysis of the axillary lymph nodes is often required for staging and treatment of malignancies such as breast cancer.
– When a dissection of the axillary lymph node is done, the long thoracic nerve and the thoracodorsal nerves are in danger.
• Variations of the Brachial Plexus– Variations in the brachial plexus are common.
• Brachial Plexus Injuries– Affect movements and cutaneous sensations in the upper limb.
– Occur secondary to disease or trauma in the neck or axilla..
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APPLIED ANATOMYCONTD.
• Brachial Plexus Block
◼ An injection of an anesthetic solution into the angle between the posterior border of the sternocleidomastoid and the clavicle.
◼ This surrounds the thin axillary sheet that contains the cords of the brachial plexus and axillary vessels.
◼ The anesthetic interrupts nerve impulses and produces anesthesia in the structures supplied by the branches of the cords of the plexus.
◼ This procedure, in combination with an occlusive tourniquet technique, helps surgeons to operate on the upper limb without using general anesthetic.
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SCAPULAR ANASTOMOSIS
‘LEYE OLABIYI
ANATOMY DEPARTMENT
CMUL
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SCAPULAR ANASTOMOSIS
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• The scapular anastomosis is a system
connecting certain subclavian artery and
their corresponding axillary artery, forming
an anastomosis around the scapula. It
allows blood to flow past the joint in case
of occlusion, damage, or pinching of the
scapular arteries.
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• transverse cervical artery
• dorsal scapular artery (the anastomosing
branch of the transverse cervical)
• transverse scapular artery
• branches of subscapular artery
• branches of thoracic aorta
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• The transverse cervical artery gives off a
branch, the dorsal scapular artery, which
runs down the vertebral border of the
scapula to its medial edge and inferior
angle.
• The dorsal scapular artery anastomoses
with the subscapular artery, providing an
alternate route to the 3rd part of the
axillary artery in the event of a slowly
forming occlusion.
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• The suprascapular artery branches off
from the thyrocervical trunk, which in turn
arises from the first part of the subclavian
artery.
• This suprascapular artery crosses over the
suprascapular ligament, passes through
the supraspinous fossa and turns around
the lateral border of the spine of the
scapula and supplies the infraspinous
fossa as far as the inferior angle.
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• The subscapular artery branches from
the third part of the axillary and supplies
the subscapularis muscle in the
subscapular fossa as far as the inferior
angle.
• The subscapular artery gives off a
circumflex scapular branch that enters the
infraspinous fossa on the dorsal surface of
the bone, grooving the axillary border.
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• These vessels anastamose to connect the
first part of the subclavian with the third
part of the axillary
• Providing a collateral circulation.
• This allows for blood to continue
circulating if the subclavian/axillary is
obstructed.
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ARTERIAL SUPPLY OF UPPER LIMB
• Subclavian artery
• Axillary artery
• Brachial artery
• Radial artery
• Ulnar artery
• Superficial arterial arch
• Deep palmar arch
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SUBCLAVIAN ARTERY
• Arises From:
– On Right; brachiocephalic trunk.
– On Left; arch of aorta.
• Extends from arch of aorta to lateral
border of first rib.
• Divided to 3 parts by the Scalenus anterior
•
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AXILLARY ARTERY• Continuation of subclavian artery from lateral
border of first rib to lower border of teres major
muscle
• Divided to 3 parts by pectoralis minor
• Branches
• 1st part; Superior Thyroid artery
• 2nd part; Thoracoacromial and Lateral thoracic arteries
• 3rd part; Subscapular, Ant & post humeral circumflex
•
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BRACHIAL ARTERY
• Continuation of axillary artery, From
inferior border of teres major 2 its
bifurcation in cubital fossa into radial and
ulnar arteries
• Branches
• Profunda brachii, Superior ulnar collateral
artery, Inferior ulnar collateral, Radial
Ulnar
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SUPERFICIAL AND DEEP
PALMAR ARCH
• Superficial
• Direct continuation of ulnar artery
• Completed on the lateral side by
superficial palmar branch of radial
• Deep arch
• Direct continuation of radial artery
• Completed on medial side by deep palmar
branch of ulnar
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ALLEN TEST
• To check patency of palmar arches
• One of these arteries is compressed after
blood has been forced out of the hand by
clenching it into a fist
• Failure of change of color of the hand
when opened indicates that the artery not
compressed is not patent
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Branches
• Internal thoracic artery
• Vertebral artery
• Thyrocervical trunk
• (a) Suprascapular artery; forms
anastomosis around scapula
• (b) Transverse cervical
• (c) Inferior thyroid
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