Lab 2- deep back, spinal cord, posterior shoulder

Lab 2 quiz review

What is the blue highlighting?

Splenius capitis m. (cut edge)

What is the purple star identifying?

Semispinalis capitis m.

What is the yellow arrow pointing at?

Greater occipital nerve (C2)

What is the yellow arrow pointing at?

suboccipital nerve (C1)

What is the dark blue identifying?

Rectus Capitis posterior minor

What is the yellow identifying?

Rectus capitis posterior major

What is the green identifying?

Obliquus capitis superior

What is the red identifying?

Obliquus capitis inferior

What passes through the suboccipital triangle?

Vertebral artery and suboccipital nerve

What is the red arrow showing?

Vertebral artery

What is the blue arrow pointing to?

Denticulate ligament

What are the orange arrows pointing at?

Filum terminale

What artery is shown here?

Suprascapular artery

What nerve is shown here?

Suprascapular nerve

What ligament is between this artery and nerve?

Superior transverse scapular ligament

What is the blue space called?

Quadrangular space

What does the blue space contain?

Axillary nerve, posterior circumflex humeral artery

What is the green space called?

Triangular space

What is in the green space?

Circumflex scapular artery

What is the orange space called?

triangular interval

What is in this orange space?

Radial nerve and deep brachial artery

What separates the quadrangular space, triangular space and triangular interval?

Teres major muscle and long head of triceps muscle

What are the four rotator cuff muscles?

infraspinatus, supraspinatus, subscapularis, and teres minor.

What is the innervation and supply for the infraspinatus?

Suprascapular nerve, suprascapular artery

Attachment of infraspinatus

origin: infraspinous fossa of scapula, insertion: greater tubercle of humerus

Action of infraspinatus

Provides glenohumeral stability

Innervation and supply for supraspinatus

Suprascapular nerve, suprascapular and dorsal scapular artery

Attachment of supraspinatus

Origin: supraspinous fossa of scapula, attaches to greater tubercle of humerus

action of the supraspinatus

Abduction of arm and pulls head of humerus medial toward glenoid cavity

Subscapularis blood supply and innervation?

Blood supply: axillary, subscapular artery, suprascapular arteries

Innervation: subscapular nerves C5-C6

Subscapularis attachment

Origin: subscapular fossa, insertion: lesser tubercle of humerus

Subscapularis action

Internal rotation of humerus

Teres minor blood supply and innervation

Blood: subscapular artery, circumflex artery and posterior circumflex humeral artery

innervation: axillary nerve

Teres minor attachment

origin: posterior surface of scapula

insertion: greater tubercle of humerus

Action of the teres minor

Stabilizes glenohumeral joint, lateral and external rotation of arm at shoulder joint.