Posterior triangle of neck

The sternocleidomastoid divides posterior triangle of neck into 2 subdivisions.

• TRUE

• FALSE

Answer explanation

Sternocleidomastoid (SCM) divides the neck into 2 triangles.

Inferior belly of omohyoid divides the posterior triangle of neck into 2 subdivisions.

The subdivisions of posterior triangles are

• Submental triangle

• Submandibular triangle

• Occipital triangle

• Supraclavicular triangle

Answer explanation

The posterior triangle consists of

1.Occipital triangle

2. Supraclavicular triangle

(subclavian/ omoclavicular triangle)

Name this nerve

Answer explanation

Accessory nerve has 2 roots

1. cranial root

2. spinal root

the accessory nerve located in posterior triangle is the spinal root of accessory nerve

Which part of brachial plexus are located in supraclavicular triangle

• Middle trunk

• Dorsal scapular nerve

• Long thoracic nerve

• Nerve to subclavius

Answer explanation

All trunks of brachial plexus are in supraclavicular triangle

(upper, middle, lower)

Small branches from upper trunk

1. Suprascapular nerve

2. Nerve to subclavius

Small branch from roots

1. Long thoracic nerve

Which is not the content of posterior triangle of neck

• inferior belly of omohyoid

• Occipital artery

• Trapezius

• Virchow's node

Answer explanation

Trapezius forms the posterior border of posterior triangle of neck

Which nerve is located along the superficial surface of anterior scalene muscle

• Supraclavicular nerve

• Brachial plexus

• Phrenic nerve

• Spinal accessory nerve

Answer explanation

Phrenic nerve, a branch from cervical plexus, runs downwrards along superficial surface of anterior scalene muscle

External jugular vein is the usual site for central venous catheterization

• TRUE

• FALSE

Answer explanation

False!

The correct answer is subclavian vein.

Erb's palsy is related to which posterior triangle of neck?

• Occipital triangle

• Supraclavicular triangle

Answer explanation

Erb's palsy involves paralysis of the arm caused by the injury to the upper group of the main nerves supplying it, specifically the upper trunk C5-C6 of the brachial plexus.

Upper trunk of brachial plexus & its small branches (supraclavicular nerve, nerve to subclavius) are located in the supraclavicular triangle.

Trosier sign only refers to the left supraclavicular lymph nodes enlargement.

• TRUE

• FALSE

Answer explanation

TRUE!

Trosier sign is only LEFT supraclavicular lymph nodes enlargement.

Also known as sentinel node/signal node