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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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slide1

POSTERIOR TRIANGLE

OF NECK

STEVEN J. ZEHREN, PH.D.

slide2

BOUNDARIES

OF POSTERIOR TRIANGLE

slide4

STERNOCLEIDOMASTOID MUSCLE (SCM)

Mastoid process

Sternal head

Clavicular head

slide9

XI. SPINAL ACCESSORY N.

SKELETAL MOTOR --- TO STERNOCLEIDOMASTOID & TRAPEZIUS MUSCLES

XI

STERNOCLEIDOMASTOID M.

TRAPEZIUS M.

slide10

ROOF

OF POSTERIOR TRIANGLE

slide11

Investing layer of

deep cervical fascia

Platysma m.

slide12

FLOOR

OF POSTERIOR TRIANGLE

slide13

MUSCLES OF FLOOR OF POSTERIOR TRIANGLE

Muscles of floor

Splenius capitis m.

Levator scapulae m.

Post., mid., & ant.

scalene mm.

slide14

FASCIAL FLOOR OF POSTERIOR TRIANGLE

Prevertebral layer

of deep cervical fascia

slide18

SCALENE MUSCLES

Anterior scalene m.

Middle scalene m.

Posterior scalene m.

Rib 1

slide19

MUSCLES PRODUCING MOVEMENT OF THE

CERVICAL INTERVERTEBRAL JOINTS

slide21

CONTENTS

OF POSTERIOR TRIANGLE

slide23

OMOHYOID MUSCLE

Omohyoid (superior belly)

Omohyoid m. (inferior belly)

slide24

OCCIPITAL AND OMOCLAVICULAR TRIANGLES

Occipital triangle

Omoclavicular triangle

(supraclavicular triangle)

(subclavian triangle)

slide27

CAREFREE & CAREFUL ZONES

Accessory N. (XI)

slide28

F. magnum

Jugular f.

C2 spinal n.

Acessory n. (XI)

Sternocleidomastoid m.

C3 spinal n.

C4 spinal n.

Trapezius m.

Efferent fibers

Afferent fibers

slide29

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.

slide31

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

slide32

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)

slide35

ARTERIES IN POSTERIOR TRIANGLE

TRANSVERSE CERVICAL A.

THYROCERVICAL TRUNK

SUPRASCAPULAR A.

slide36

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.

slide38

BOUNDARIES & CONTENTS OF THE INTERSCALENE TRIANGLE

Anterior scalene m.

Middle scalene m.

Brachial plexus

Subclavian a.

Rib 1

slide39

Anterior scalene m.

Middle scalene m.

Cervical rib

compresses

subclavian a.

slide40

Lowest trunk of brachial plexus

elevated by cervical rib

slide41

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.

slide45

Investing fascia

Retropharyngeal space

Pretracheal fascia *

Buccopharyngeal fascia *

Carotid sheath

Common carotid a.

Internal jugular v.

Vagus n.

Prevertebral fascia

* = Component of visceral fascia

slide46

Base of skull

Buccopharyngeal fascia

Retropharyngeal space

Prevertebral fascia

Mediastinum

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