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The Breast

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- 2nd or 3rd rib superiorly

- inframammary folds

6th or 7th ribs inf.- sternum medially

- AAL or MAL laterally

and ant. Axillary fold

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Breast

Blood Supply

internal mammary artery

posterior intercostal arteriesaxillary arteries

highest thoracic

lateral thoracic

thoracoacromial

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Breast

Venous Drainageperforating branches of the internal

mammary vein

tributaries to the axillary vein

perforating branches of the posterior

intercostal veins

* Circulus venosus- venous anastomotic

circle around the nipple

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Breast

Sensory innervation of the breast

lateral and anterior cutaneous branches

of the 2nd to 6th intercostal nervesAnterior and medial branches of the

supraclavicular nerve

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Lymphatic Drainage

axillary lymph node groups axillary vein group(lateral group)- 4-6 lymph

nodes that lie medial or posterior the axillary

vein

external mammary group(ant. or pectoral

group)- 4-5 lymph nodes @ the lower border

of the pectoralis minor

scapular group(posterior or subscapulargroup)- 6-7 lymph nodes near the posterior

wall of the axilla

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Lymphatic drainage cont.

central group- 3-4 large nodesembedded in the fat of the axilla

behind the pectoralis muscle

subclavicular group(apical group) 6-12lymph nodes partially post. And

partially above the pectoralis minor

interpectoral or Rotters group- 1 to 4nodes

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Autonomic Nervous System

Innervation of involuntary structures

found in the central and peripheral nervous

system

Divided into 2 parts:

Sympathetic nervous system

Parasympathetic nervous system

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Sympathetic Nervous System

Prepares the body for emergency

Efferent Fibers

Cell bodies of the sympathetic neurons -LateralHorn of Gray matter of the spinal cord from T1

to L2

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Sympathetic

Nervous System

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Parasympathetic

Nervous

System

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Parasympathetic Nervous System

Myelinated axons leave the spinal cord in

the ant. nerve roots of the correspondingspinal nerves

They then leave the sacral nerves and

form the Pelvic Splanchnic NervesCranial preganglionic fibers relay in the

pterygopalatine, submandibular and otic

ganglia.Preganglionic fibers of the pelvic

splanchnic nerve relay in the ganglia in

the pelvic plexus