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Suboccipital MusclesSuboccipital Muscles

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Suboccipital TriangleSuboccipital Triangle

Boundaries? Contents?

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Posterior Triangle of The NeckPosterior Triangle of The Neck

(Lateral Cervical Region)(Lateral Cervical Region)

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BoundariesBoundaries

Ant.:post. border of SCM

Post.:

ant. border of trapezius

Inf.:

mid. 1/3 of clavicle

Roof:skin & fascia

Floor:

prevertebral muscles

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Floor ofPosterior TriangleFloor ofPosterior Triangle

Lat. & Post. vertebral M.

3 scalene muscles

(ant. = inferomedial angle)

3 post.:

levator scapulae

splenius capitis

semispinalis capitis

(apex)

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Subdivisions ofPost. TriangleSubdivisions ofPost. Triangle

By inf. belly of omohyoid

- Occipital triangle

- Supraclavicular triangle:(omoclavicular, subclavian)

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Arteries in Post. TriangleArteries in Post. Triangle

3rd part of subclaviananteroinf. angle

Transverse cervical a.

(superficial cervical)

ant. to phrenic n. & ?

Suprascapular a.

inf. to transverse cervical

supply?

Occipital a.

from ECA, at apex oftriangle

supply?

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Subclavian ArterySubclavian Artery

1st par 2nd part 3rd part

Extension? Extension? Extension?

Branches? Branches? Branches?

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Branches of 1Branches of 1stst Part of SubclavianPart of Subclavian

1. Vertebral a.sup. Aspect

between Sc. Ant. & longus colli

trans. Foramina of C6-C1

into F. magnum

2. Thyrocervical Trunk:

ant. aspect

3 arteries:

inf. thyroid a

transverse (or superficial) cervicalsuprascapular a

* Transversecervicala. becomesthedorsalscapulara.posteriorly

3. Internal Thoracic a.:inf. aspect

descends behind 1st cc

branches:

ant. intercostal a. (1-6)

terminations:sup. Epigastric

musculophrenic (7-9)

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Branch of 2Branch of 2ndnd Part of SubclavianPart of Subclavian

Costocervical Trunk:

post. aspect

divides above the neck of 1st rib:

sup. Intercostal a.:

1st & 2nd post. intercostal a.

deep cervical a.:

muscles of back of the neck

* 3rd

partofsubclavianhasno branches,orsometimesthedorsalscapulara. arisefromthere (3rdpart)

*ifthe dorsalscapulara.arisefrom 3rdpart

transversecervicala.iscalledsuperficialcervicala.

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Veins in Post. TriangleVeins in Post. Triangle

1. EJV:

Post. division of retromand. V.

Post. auricular V.

(Extent& musclerelations?)

2. Occipital v.

3. Transverse cervical v.

4. Suprascapular v.

5. Subclavian v.:inferomedial angle

receives EJV

join with IJV (oppositeto?)

to form brachiocephalic v.

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Nerves in Post. TriangleNerves in Post. Triangle

Cutaneous Nerves:

4nerves??

Spinal division of accessory n.

(spinal XI)

Brachial Plexus

(Roots & Trunks)

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Spinal XISpinal XI

Arise from spinal cord

In post. triangle:

beneath post. border of SCM

on levator scapulae m.

deep to ant. border of

trapezius

Innervations:

SCM & Trapezius

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Brachial PlexusBrachial Plexus

(Roots & Trunks)(Roots & Trunks)

Roots:

C5-T1 (ant. rami)

in scalene hiatus

branches?2

Trunks:

sup., middle, inf.

in post. triangle

branches?2

* DivisionsofB.P.arelocated

behindtheclavicle

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Contents of post.Triangle:

4 arteries

5 veins

3 kinds of nerves:

4cutaneous

Spinal

B.P(roots & trunks)