Lab Unit 06: Thorax & Cardiopulmonary Flashcards
Rhomboid Major & Minor
Origin (PA): • Major: SP T2-5. • Minor: Nuchal ligament and SP C7, T1.
Insertion (DA): • Major: Medial border of scapula from level of spine to inferior angle.
• Minor: Medial border at root of spine of scapula.
Nerve: Dorsal scapular n. (C4, C5).
**Action: ** Adducts, elevates, and downwardly rotates scapula.
Pectoralis Major
Origin (PA): •Clavicular head: Anterior surface of medial half of clavicle. • Sternocostal head: Anterior surface of sternum, superior 6 costal cartilages, and aponeurosis of external oblique muscle.
**Insertion (DA): **Lateral lip of intertubercular groove of humerus.
Nerve: Lateral and medial pectoral nerves
• Clavicular head: (C5, C6, C7)
• Sternal head: (C8, T1).
Action: • Clavicular head: Flexes, adducts, and internally rotates humerus. • Sternal head: Extends, adducts, and internally rotates humerus.
Pectorails Minor
PA: 3rd to 5th ribs near their costal cartilages.
DA: Coracoid process of scapula.
N: Medial pectoral n. (C8, T1).
A: Stabilizes scapula by drawing it inferiorly and anteriorly against the thoracic wall.
Serratus Anterior
PA: External surfaces of lateral parts of 1st to 8th ribs.
DA: Anterior surface of medial border of scapula.
N: Long thoracic n. (C5, C6, C7).
A: Abducts and upwardly rotates scapula; stabilizes the medial border of the scapula against thoracic wall.
Levator costorum
SA: TP C7-T11.
IA: Subjacent ribs between tubercle and angle.
N: PR C8-T11.
A: Elevate ribs.
External Abdominal Obliques
O: External surfaces of 5th-12th ribs.
I: Linea alba, pubic tubercle, and anterior half of iliac crest.
N: Thoracoabdominal nerves (AR T7-T11) and subcostal nerve.
A: Flex trunk, laterally flex trunk to ipsilateral side, rotate trunk to contralateral side (with opposite internal oblique). Compresses/supports abdominal viscera.
Internal Abdominal Obliques
O: Thoracolumbar fascia, anterior two thirds of iliac crest and connective tissue deep to the lateral third of inguinal ligament.
I: Inferior borders of 10th-12th ribs, linea alba, and pecten pubis via conjoint tendon.
N: Thoracoabdominal nerves (AR T6-T12) and first lumbar nerves.
A: Flex trunk, laterally flex trunk to ipsilateral side, and rotate trunk to ipsilateral side.
Compresses/supports abdominal viscera.
Transversus Abdominus (TA)
O: Internal surfaces 7th-12th costal cartilages, thoracolumbar fascia, iliac crest, and connective tissue deep to lateral third of inguinal ligament.
I: Linea alba with the aponeurosis of the internal oblique, pubic crest, and pecten pubis via the conjoint tendon.
N: Thoracoabdominal nerves (AR T6-T12) and first lumbar nerves.
A: Compresses/supports abdominal viscera.
Rectus Abdominus
O: Pubic symphysis and pubic crest.
I: Xiphoid process and costal cartilages of 5th-7th ribs.
N: Thoracoabdominal nerves (AR T6-T12)
A: Flexes trunk (lumbar vertebrae) and compresses/supports abdominal viscera.
Anterior Deltoid
PA: Lateral third of clavicle.
DA: Deltoid tuberosity of humerus.
N: Axillary n. (C5, C6).
A: Flexes, medially rotates humerus.
Middle Deltoid
PA: Acromion.
DA: Deltoid tuberosity of humerus.
N: Axillary n. (C5, C6).
A: Abducts humerus.
Posterior Deltoid
PA: Spine of scapula.
DA: Deltoid tuberosity of humerus.
N: Axillary n. (C5, C6).
A: Extends, laterally rotates humerus.
Teres Major
PA: Posterior surface of inferior angle of scapula.
DA: Medial lip of intertubercular groove of humerus.
N: Lower Subscapular n. (C5, C6).
A: Extends, adducts, and internally rotates humerus.
Teres Minor
PA: Middle part of lateral border of scapula.
DA: Inferior facet of greater tubercle of humerus.
N: Axillary n. (C5, C6).
A: Externally rotates humerus; depresses and compresses humeral head in glenoid.
Supraspinatus
PA: Supraspinous fossa of scapula.
DA: Superior facet of greater tubercle of humerus.
N: Suprascapular n. (C4, C5, C6).
A: Abducts humerus; depresses and compresses humeral head in glenoid.
