3 Deep Pectoral Region & Axilla Pectoralis MinorOrigin: Corocoid process of scapula.Insertion: Ribs 2 to 5Innervation: Medial pectoral nerve (C8, T1)Action: Protracts scapula; elevates ribs.Serratus AnteriorExternal IntercostalsInternal Intercostals
4 Veins & Arteries of the Axilla Main thing to be preserved from the axillary region is the axillary artery and the brachial plexus. Almost all nervous system and vascular networks for the arm originate off of these two structures.
5 Muscles of the Upper Arm Brachialis MuscleO: Distal half of anterior surface of the humerusI: Tuberosity of the ulna and anterior surface of the coronoid processA: Powerful flexor of the forearmN: Musculocutaneous nerve and sometimes small branch of radial nerve (C5, C6)Coracobrachialis MuscleO: Coracoid process of the scapulaI: Medial surface of humerus near its middleA: Flexes and adducts the armN: Musculocutaneous nerve (C6, C7)
6 Main Blood Supply Vasculature Axillary Artery (Becomes Brachial Artery once past axillary region)Profunda (deep) brachii arterySuperior ulnar collateral arteryRadial collateral artery
7 Innervation of the Upper (Musculocutaneous Nerve)
9 Abdominal Muscles Internal oblique Transverse abdominis O: Lateral 2/3 of inguinal ligament; the middle lip of iliac crest; the thoracolumbar fasciaI: Inferior border of lower 3-4 ribs; the linea alba; aponeurosis fuses with that of the external oblique to help form the rectus sheathA: Compresses abdominal viscera; both muscles: flex the trunk forward; each muscle: bends the trunk to that side but rotates the front of the abdomen toward the same sideN: Lower five thoracic nerves and the first lumbar nerve (T8-L1)Transverse abdominisO: Lateral third of inguinal ligament and inner lip of iliac crest; thoracolumbar fascia; inner surface of lower six ribsI: Ends in aponeurosis; upper fibers: to line alba, help form posterior layer of rectus sheath; lower fibers: attach to pubis to form conjoined tendonA: Tenses abdominal wall; compresses abdominal contentsN: Lower six thoracic and first lumbar nerves (T7-L1)
10 More Abs! Rectus Abdominis O: 5th 6th 7th Costal Cartlidges, Costal xiphoid ligaments and Xiphoid process.I: Crest of pubis and pubis tuberical, front of symphasis pubis.A: Flexes vertebral column, tenses anterior abdominal wall. Compresses abdominal contents.Innervations: Lower 7 thoracic nevers T6-T12.