MCQ – 66879

Correct Answer � C Explanation

Ans:C.)Suprascapular Nerve.

Occipital triangle is shown in the image marked by ‘A’

POSTERIOR TRIANGLE OF NECK
Boundaries

Anterior border – posterior border of sternocleidomastoid muscle

Posterior border– anterior border of trapezius

Base – Superior surface of middle 1/3rd of clavicle

Apex – Superior nuchal line at junction of sternocleidomastoid and trapezius muscles

Roof – Skin & superfical fascia(platysma), investing layer of deep cervical fascia.

Floor- prevertebral layer of deep cervical fascia covering : splenius capitis, levator scapulae, scalenus medius, semispinalis capitis

SUBDIVISION OF POSTERIOR TRIANGLE

•  By Inferior belly of omohyoid muscle into Occipital triangle and Supraclavicular triangle

OCCIPITAL TRIANGLE

Floor

• Semispinalis capitis
• Splenius capitis
• Levator scapulae
• S-medium and post.

Contents

NERVES:-

• Spinal part of accessory nerve
• Four cutaneous branches of cervical plexus:-

1. Lesser occipital nerve (C2)
2. Great auricular nerve (C2, C3)
3. Anterior cutaneous nervel of neck (C2, C3)
4. Supraclavicular nerve (C3, C4)

• Muscular branches:-

1. Two small branches to levator scapulae(C3,C4)
2. Two smal branches to the trapezius (C3,C4)
3. Nerve to rhomboideus (proprioceptive) (C5)

VESSELS:-

• Transverse cervical artery & vein
• Occipital artery 

SUPRACLAVICULAR TRIANGLE(SUBCLAVIAN TRIANGLE)
Boundaries

• Roof :
  • Skin
  • S/F (platysma)
  • investing layer of deep cervical fascia, pierced by three diverging branches of supraclavicular nerve and external jugular vein.
• Floor
  • Outer border of 1st rib
  • S. medius (near insertion)
  • 1st digitation of serratous anterior

Contents

NERVES:-

• Three trunks of brachial plexus
• Nerve to serratus anterior (long thoracic C5,C6,C7)
• Nerve to subclavius (C5, C6)
• Suprascapular nerve (C5, C6)

VESSELS:-

• Third part of subclavian artery & vein
• Suprascapular artery & vein
• Terminal part of external jugular vein