POSTERIOR TRIANGLE OF NECK

Question 1

BOUNDARIES

Answer 1

ANTERIOR -Posterior border of sternocleidomastoid
POSTERIOR- anterior border of trapezius
BASE-middle one third of clavicle
APEX- superior nuchal line and meeting of the 2 muscles

Question 2

ROOF

Answer 2

investing layer of deep cervical fascia
superficial fascia contains-
1. platysma
2. external jugular and posterior external jugular vein
3. lymph vessels( end in supraclavicular nodes)
3.unamed arteries
4. parts of supraclavicular, great auricular, transverse cutaneous and lesser occipital nerves.

Question 3

FLOOR

Answer 3

prevertebral layer of deep fascia that covers

1. Splenius capitis
2. Levator scapulae
3. Scalenus medius
4. Semispinalis capitis may form a part

Question 4

DIVISION

Answer 4

Larger upper- occipital part

and smaller lower- supraclavicular part by the inferior omohyoid muscle.

Question 5

EXTERNAL JUGULAR VEIN

Answer 5

FORMATION-union of posterior auricular vein and posterior division of retromandibular vein.
COURSE-lower part of the parotid gland crosses sternocleidomastoid and pierces roof of posterior triangle and drains into subclavian vein.
TRIBUTARIES-
1. Posterior external jugular vein
2. transverse cervical vein
3.suprascapular vein
4.anterior jugular vein
CLINICAL-If it is cut, it cannot close as its margins are adherent to the fascia. Hence air is sucked in due to negative intrathoracic pressure causing air embolism. Hence deep fascia has to be cut.

Question 6

CONTENTS OF OCCIPITAL TRIANGLE

Answer 6

NERVES-

1. Spinal accessory nerve
2. Four cutaneous branches of cervical plexus- lesser occipital, great auricular, anterior cutaneous nerve, supraclavicular.
3. Muscular branches- 2 small branches to to levator scapulae, two small branches to trapezius, nerve to rhomboids.

VESSELS-

1. Transverse cervical artery and vein.
2. Occipital artery

LYMPH NODES-
Supraclavicular nodes and occipital nodes.

Question 7

CONTENTS OF SUBCLAVIAN TRIANGLE

Answer 7

NERVES-

1. Roots and trunk of brachial plexus
2. Nerve to serratus anterior
3. Nerve to subclavius
4. Suprascapular nerve

VESSELS-

1. 3rd part of subclavian artery and subclavian vein
2. suprascapular artery & vein
3. lower part of external jugular vein
4. begining of transvers cervical artery & ending of corr. vein

LYMPH NODES
few members of supraclavicular chain

Question 8

DIAGRAM

Answer 8

Check notes now