Neck Muscles
Label the diagrams
3
Viva questions
31Name structures forming the boundaries of posterior triangle
2What is the the nerve supply of sternocleidomastoid and trapezius muscles.
3What is the nerve supply of diagastric muscles
Short-answer questions
1Boundaries and contents of posterior triangle
Boundaries of posterior triangle
In front - posterior border of sternocleidomastoid
Behind - Anterior border of trapezius
Base - middle one third of clavicle
Apex - superior nuchal line where these 2 muscles meet
Roof - Skin, superficial fasica, platysma, investing layer of deep cervical fascia
Floor - semispinalis capitis, splenius capitis, levator scapulae, scaleneus anterior, medius and posterior
Contents of posterior triangle
The triangle is divided into upper large Occipital triangle and lower small supra-clavicular triangle by inferior belly of omohyoid muscle
Contents of Occipital triangle : Spinal Accessory nerve, 3rd & 4th cervical nerves, dorsal scapular nerve, four cutaneous branches of cervical plexus (lesser occipital, great auricular, transverse cervical, supraclavicular), occipital artery
Contents of supraclaviular triangle: subclavian artery, subclavian vein, terminal part of external jugular vein, trunks of brachial plexus
