Musculo-neuro-vascular systems of pectoral and dorsal regions Flashcards
What is muscle
Contractile tissue made of myocytes
Muscle origin
Proximal attachment (usually remains fixed)
Muscle insertion
Distal attachment (usually moves)
Skeletal muscle consists of :
myocytes bundled into fascicles, bundled into muscle
Brachial
Relating to, or situated in the arm
Plexus
A network of anastomosing or interlacing blood vessels or nerves
Brachial plexus
The system of nerves that emerge lateral to the spinal cord and
Allow motor nerves to send their signals from brain to upper limb muscles
Allow sensory nerves to send their signals back to the brain
Movements of the scapula
Elevation + depression
Protraction + retraction
Upward + downward rotation
Scapular movers/ stabilizers (6)
Trapezius
Levator scapulae
Rhomboid minor
Rhomboid major
Pectoralis minor
Serratus anterior
Origin of trapezius
External occipital protuberance
Nuchal ligament
Spinous process of C7-T12 vertebrae
Insertion of trapezius
Spine of scapula
Acromion of scapula
Lateral 1/3 of clavicle
Innervation of trapezius
Spinal accessory nerve (cranial nerve 11)
Actions of trapezius (4)
Powerful retractor of scapula
Elevates scapula
Depresses scapula
Upward rotation of scapula
Origin of levator scapula
Transverse processes of C1-4 vertebrae
Insertion of levator scapula
Superior part of medial border of scapula
Innervation of levator scapula
Dorsal scapular nerve (C4 - 5)
Actions of levator scapula
Elevates medial border of scapula
Downward rotation of scapula
Origin of rhomboid minor
Spinous process of C7-T1 vertebrae
Insertion of rhomboid minor
Medial border of scapula root of the spine
Innervation of rhomboid minor
Dorsal scapular nerve (C4 - 5)
Actions of rhomboid minor
Retracts scapula
Downward rotation of scapula
Roots of dorsal scapular nerve
Spinal nerve roots C4 -5
Course of dorsal scapular nerve
Passes inferiorly, medial to medial border of scapula
Origin of pectoralis minor
Anterior surface of ribs 3-5
Insertion of pectoralis minor
coracoid process of the scapula