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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

POSTERIOR TRIANGLE

OF NECK

STEVEN J. ZEHREN, PH.D.


Posterior triangle of neck steven j zehren ph d

BOUNDARIES

OF POSTERIOR TRIANGLE


Posterior triangle of neck steven j zehren ph d

STERNOCLEIDOMASTOID MUSCLE (SCM)

Mastoid process

Sternal head

Clavicular head




Posterior triangle of neck steven j zehren ph d

XI. SPINAL ACCESSORY N.

SKELETAL MOTOR --- TO STERNOCLEIDOMASTOID & TRAPEZIUS MUSCLES

XI

STERNOCLEIDOMASTOID M.

TRAPEZIUS M.


Posterior triangle of neck steven j zehren ph d

ROOF

OF POSTERIOR TRIANGLE


Posterior triangle of neck steven j zehren ph d

Investing layer of

deep cervical fascia

Platysma m.


Posterior triangle of neck steven j zehren ph d

FLOOR

OF POSTERIOR TRIANGLE


Posterior triangle of neck steven j zehren ph d

MUSCLES OF FLOOR OF POSTERIOR TRIANGLE

Muscles of floor

Splenius capitis m.

Levator scapulae m.

Post., mid., & ant.

scalene mm.


Posterior triangle of neck steven j zehren ph d

FASCIAL FLOOR OF POSTERIOR TRIANGLE

Prevertebral layer

of deep cervical fascia





Posterior triangle of neck steven j zehren ph d

SCALENE MUSCLES

Anterior scalene m.

Middle scalene m.

Posterior scalene m.

Rib 1


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MUSCLES PRODUCING MOVEMENT OF THE

CERVICAL INTERVERTEBRAL JOINTS



Posterior triangle of neck steven j zehren ph d

CONTENTS

OF POSTERIOR TRIANGLE



Posterior triangle of neck steven j zehren ph d

OMOHYOID MUSCLE

Omohyoid (superior belly)

Omohyoid m. (inferior belly)


Posterior triangle of neck steven j zehren ph d

OCCIPITAL AND OMOCLAVICULAR TRIANGLES

Occipital triangle

Omoclavicular triangle

(supraclavicular triangle)

(subclavian triangle)




Posterior triangle of neck steven j zehren ph d

CAREFREE & CAREFUL ZONES

Accessory N. (XI)


Posterior triangle of neck steven j zehren ph d

F. magnum

Jugular f.

C2 spinal n.

Acessory n. (XI)

Sternocleidomastoid m.

C3 spinal n.

C4 spinal n.

Trapezius m.

Efferent fibers

Afferent fibers


Posterior triangle of neck steven j zehren ph d

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.



Posterior triangle of neck steven j zehren ph d

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


Posterior triangle of neck steven j zehren ph d

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)




Posterior triangle of neck steven j zehren ph d

ARTERIES IN POSTERIOR TRIANGLE

TRANSVERSE CERVICAL A.

THYROCERVICAL TRUNK

SUPRASCAPULAR A.


Posterior triangle of neck steven j zehren ph d

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.



Posterior triangle of neck steven j zehren ph d

BOUNDARIES & CONTENTS OF THE INTERSCALENE TRIANGLE

Anterior scalene m.

Middle scalene m.

Brachial plexus

Subclavian a.

Rib 1


Posterior triangle of neck steven j zehren ph d

Anterior scalene m.

Middle scalene m.

Cervical rib

compresses

subclavian a.


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Lowest trunk of brachial plexus

elevated by cervical rib


Posterior triangle of neck steven j zehren ph d

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.



Posterior triangle of neck steven j zehren ph d

CERVICAL PLEURA (CUPULA)

Cervical pleura



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Investing fascia

Retropharyngeal space

Pretracheal fascia *

Buccopharyngeal fascia *

Carotid sheath

Common carotid a.

Internal jugular v.

Vagus n.

Prevertebral fascia

* = Component of visceral fascia


Posterior triangle of neck steven j zehren ph d

Base of skull

Buccopharyngeal fascia

Retropharyngeal space

Prevertebral fascia

Mediastinum