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POSTERIOR TRIANGLE OF NECK STEVEN J. ZEHREN, PH.D. BOUNDARIES OF POSTERIOR TRIANGLE. STERNOCLEIDOMASTOID MUSCLE (SCM). Mastoid process. Sternal head. Clavicular head. TORTICOLLIS. TRAPEZIUS MUSCLE. XI. SPINAL ACCESSORY N.

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POSTERIOR TRIANGLE

OF NECK

STEVEN J. ZEHREN, PH.D.


BOUNDARIES

OF POSTERIOR TRIANGLE


STERNOCLEIDOMASTOID MUSCLE (SCM)

Mastoid process

Sternal head

Clavicular head




XI. SPINAL ACCESSORY N.

SKELETAL MOTOR --- TO STERNOCLEIDOMASTOID & TRAPEZIUS MUSCLES

XI

STERNOCLEIDOMASTOID M.

TRAPEZIUS M.


ROOF

OF POSTERIOR TRIANGLE


Investing layer of

deep cervical fascia

Platysma m.


FLOOR

OF POSTERIOR TRIANGLE


MUSCLES OF FLOOR OF POSTERIOR TRIANGLE

Muscles of floor

Splenius capitis m.

Levator scapulae m.

Post., mid., & ant.

scalene mm.


FASCIAL FLOOR OF POSTERIOR TRIANGLE

Prevertebral layer

of deep cervical fascia





SCALENE MUSCLES

Anterior scalene m.

Middle scalene m.

Posterior scalene m.

Rib 1


MUSCLES PRODUCING MOVEMENT OF THE

CERVICAL INTERVERTEBRAL JOINTS



CONTENTS

OF POSTERIOR TRIANGLE



OMOHYOID MUSCLE

Omohyoid (superior belly)

Omohyoid m. (inferior belly)


OCCIPITAL AND OMOCLAVICULAR TRIANGLES

Occipital triangle

Omoclavicular triangle

(supraclavicular triangle)

(subclavian triangle)




CAREFREE & CAREFUL ZONES

Accessory N. (XI)


F. magnum

Jugular f.

C2 spinal n.

Acessory n. (XI)

Sternocleidomastoid m.

C3 spinal n.

C4 spinal n.

Trapezius m.

Efferent fibers

Afferent fibers


5 Roots

(vental rami)

3 Trunks

3 ant. Divisions

3 post. Divisions

C5

C6

Superior

3 Cords

C7

Middle

C8

5 terminal Branches

Inferior

T1

Lateral

Musculocutaneous n.

Posterior

Axillary n.

Medial

Radial n.

“Roger Travis Drinks Cold Beer”

Median n.

Ulnar n.



FIVE COMPONENTS OF CERVICAL PLEXUS:

XII

XI

Cutaneous

NerveS

C1

Motor Nerves

To Prevertebral

Muscles

Ansa Cervicalis:

C2

SUPERIOR ROOT

C3

INFERIOR ROOT

Contributions

From C3 & C4

To XI

C4

ANSA

Phrenic Nerve


CUTANEOUS BRANCHES OF THE CERVICAL PLEXUS

CERVICAL PLEXUS

Lesser occipital n. (C2,3)

Great auricular n.(C2,3)

Transverse cervical n. (C2,3)

Supraclavicular nn. (C3,4)




ARTERIES IN POSTERIOR TRIANGLE

TRANSVERSE CERVICAL A.

THYROCERVICAL TRUNK

SUPRASCAPULAR A.


EXTERNAL JUGUAR VEIN

Superficial temporal v.

Maxillary v.

Facial v.

Posterior auricular v.

Retromandibular v.

Common facial v.

(to IJV)

External jugular v.

Transverse cervical v.

Suprascapular v.

Anterior jugular v.

Subclavian v.



BOUNDARIES & CONTENTS OF THE INTERSCALENE TRIANGLE

Anterior scalene m.

Middle scalene m.

Brachial plexus

Subclavian a.

Rib 1


Anterior scalene m.

Middle scalene m.

Cervical rib

compresses

subclavian a.


Lowest trunk of brachial plexus

elevated by cervical rib


ANTERIOR RELATIONSHIPS OF ANTERIOR SCALENE MUSCLE

Ascending cervical a.

Anterior scalene m.

Phrenic n.

Inferior thyroid a.

Transverse cervical a.

Suprascapular a.

Thyrocervical trunk

Subclavian v.



CERVICAL PLEURA (CUPULA)

Cervical pleura



Investing fascia

Retropharyngeal space

Pretracheal fascia *

Buccopharyngeal fascia *

Carotid sheath

Common carotid a.

Internal jugular v.

Vagus n.

Prevertebral fascia

* = Component of visceral fascia


Base of skull

Buccopharyngeal fascia

Retropharyngeal space

Prevertebral fascia

Mediastinum


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