Lec-Ana-Fnx: Back

(groups) MUSCLES OF THE BACK:

______ -Related to upper limb movements (appendicular

groups)

_________ -Respiratory Function

______-Directly related to head and vertebral column

(just read)

Superficial group of Back Muscle

Upper fibers elevate,

Middle fibers adduct, and

Lower fibers depress scapula

Assists in rotating the scapula during abduction of humerus above horizontal;

Extends,

adducts and

medially rotates

humerus

Elevates scapula

(2)

Retracts (adducts), and

elevates scapula

(just read)

Intermediate group of Back Muscles

Elevates ribs 2 to 5

Depresses ribs 9 to 12 and

may prevent lower ribs from being elevated when the

diaphragm contracts

Deep (Intrinsic) Group of Back Muscles

● ________ and _________ (_________ muscles)- the extensors and rotators of the head and neck

● ________ and ________- the extensors and rotators of the vertebral column

● ________ and ________- the short segmental muscles

(2)

Together draw head backward extending neck;

Individually – draw and rotate head to one side (turn face to same side)

(just read)

Segmental Back Muscles

Contraction elevates rib

(2)

Postural muscles that stabilize adjoining vertebrae

during movements of vertebral column

(just read)

Suboccipital Group of Back Muscles

Extension of head, rotation of head same side of muscle

Extension of head

Extension of head and bends it on same side

Rotation of face on the same side