prosection videos week 1

What innervates the intrinsic (epaxial) back muscles like erector spinae, splenius, semispinalis, and multifidus?

Dorsal rami of spinal nerves

What named dorsal ramus provides cutaneous innervation to the back of the head?

Greater occipital nerve (C2 dorsal ramus)

What nerve innervates trapezius?

Accessory nerve (CN XI)

What nerve innervates latissimus dorsi?

Thoracodorsal nerve

What nerve innervates rhomboid major and minor?

Dorsal scapular nerve

What’s the mnemonic for remembering the relationship between the suprascapular nerve and artery to the scapular ligament?

Army over Navy under the bridge” (Artery over, Nerve under)

Which artery passes over the superior transverse scapular ligament?

Suprascapular artery

Which nerve passes under the superior transverse scapular ligament to reach the supraspinous fossa?

Suprascapular nerve

What nerve innervates all three heads of triceps brachii?

Radial nerve

What nerve innervates teres major?

Lower subscapular nerve

What nerve innervates the deltoid muscle?

Axillary nerve

What nerve innervates levator scapulae?

Dorsal scapular nerve

What nerve innervates subscapularis?

Upper and lower subscapular nerves

What nerve innervates teres major?

Lower subscapular nerve

Original of the levator scapulae?

Superior angle of the scapula

Origin of the supraspinatus?

Infraspinous fossa of the scapula

What is the origin of multifidus (in lumbar region)?

Lateral sacrum and iliac crest

What is the origin of the long head of triceps brachii?

Infraglenoid tubercle of the scapula

What is the origin of teres major?

Inferior angle of the scapula

What is the origin of subscapularis?

Subscapular fossa of the scapula

What is the insertion of splenius capitis?

Mastoid process of the skull

What is the insertion of rhomboid minor?

Medial border of the scapula at the level of the spine

What is the insertion of latissimus dorsi?

One of the lips of the intertubercular sulcus of the humerus

What muscle inserts on the spine of the scapula?

Trapezius and deltoid

What muscle originates from the spine of the scapula?

Deltoid

What muscle originates from the superior angle of the scapula?

Levator scapulae

What muscle originates from the external occipital protuberance?

Trapezius

What muscle originates from the posterior shaft of the humerus?

Lateral and medial heads of triceps brachii

What muscle inserts on the floor or a lip of the intertubercular sulcus of the humerus?

Latissimus dorsi and teres major

What artery travels in the radial (spiral) groove with the radial nerve?

Deep artery of the arm (profunda brachii)

What muscle does the posterior circumflex humeral artery supply?

Deltoid

What artery passes through the quadrangular space with the axillary nerve?

Posterior circumflex humeral artery

What muscle does the suprascapular artery supply?

Supraspinatus and infraspinatu

What artery supplies both rhomboids and levator scapulae?

Dorsal scapular artery

What artery runs deep to rhomboid major and minor along the medial border of the scapula?

Dorsal scapular artery

What artery runs with the thoracodorsal nerve into latissimus dorsi?

Thoracodorsal artery

What artery runs with the accessory nerve beneath trapezius?

Transverse cervical artery

What root carries sensory fibers into the spinal cord?

Dorsal (posterior) root

What root carries motor fibers out of the spinal cord?

Ventral (anterior) root

What are the actions of latissimus dorsi?

Extend, medially rotate, and adduct the humerus

What are the actions of rhomboid major and minor?

Retract the scapula and slightly elevate it

What is the action of levator scapulae?

Elevate the scapula

What additional action does the long head of triceps brachii perform?

Adduct the arm at the shoulder

What are the actions of teres major?

Medially rotate and adduct the humerus

What is the action of subscapularis?

Medially rotate the humerus

What is the action of teres minor?

Laterally rotate the humerus

What is the action of infraspinatus?

Laterally rotate the humerus

What is the action of supraspinatus?

Abduct the humerus TIL past 15 degrees

What is the action of the posterior deltoid?

Extend the arm at the shoulder

What are the actions of latissimus dorsi?

Extend, medially rotate, and adduct the humerus

What are the actions of rhomboid major and minor?

Retract the scapula and slightly elevate it

What is the action of levator scapulae?

Elevate the scapula

What fluid fills the subarachnoid space?

Cerebrospinal fluid (CSF)

What is the name of the space through which the axillary nerve and posterior circumflex humeral artery pass?

Quadrangular space

What are the boundaries of the quadrangular space?

• Superior: Teres minor

• Inferior: Teres major

• Medial: Long head of triceps brachii

• Lateral: Humerus

What is the name of the space through which the radial nerve and deep artery of the arm pass?

Triangular interval

What are the boundaries of the triangular interval?

• Medial: Long head of triceps

• Lateral: Lateral head of triceps

• Superior: Teres major (implied)

Prosection Video Facts End Here