Trunk, Shoulder Girdle, and Upper Limb Flashcards
(32 cards)
Deltoid
Action: anterior part: flexion and medial rotation of arm. Lateral part: abduction of arm. Posterior part: extension and lateral rotation of arm
Origin: clavicle, scapula
Insertion: humorous (deltoid tuberosity)
Innervation: axillary nerve
Latissimus dorsi
Action: adduction, extension, and medial rotation of arm
Origin: sacral and lumbar spines via thoracolumbar fascia, ilium via thoracolumbar fascia, ribs, spinous processses of T6-12 vertebrae, scapula
Insertion: humerus
Innervation: thoracodorsal nerve
Pectoralis major
Action: adduction, medial rotation, flexion and extension of arm
Origin: clavicle, sternum, costal cartilages 1-6, and aponeurosis of external abdominal oblique muscle
Insertion: humerus
Innervation: lateral pectoral nerve (C5-7), medial pectoral nerve (C8-T1)
External abdominal oblique
Action: rotation of trunk (unilateral), flexion of truck (bilateral), compression of anterior abdominal wall and viscera
Origin: linea alba, ilium (crest)
Innervation: ventral rami of T8-L1 spinal nerves
Rectus abdominis
Action: flexion of trunk and compression of anterior abdominal wall
Origin: Pubis
Insertion: Sternum and costal cartilages 5-7
Innervation: ventral rami of T7-12 spinal nerves
Internal abdominal oblique
Action: rotation of trunk (unilateral), flexion of trunk (bilateral), compression of anterior well and viscera
Origin: inguinal ligament, Ilium, thoracolumbar fascia
Insertion: Linea alba, costal cartilages 7-10
Innervation: ventral rami of T8-L1 spinal nerves
Transverse abdominis
Action: compression of anterior abdominal wall and viscera
Origin: Illium, Inguinal ligament, thoracolumbar fascia, costal cartilages 7-12
Insertion: pubis, Linea alba, sternum
Innervation: ventral rami of T8-L1 spinal nerves
Psoas major
Action: flexion of thigh, lateral rotation of thigh, lateral flexion of trunk
Origin: body of T12 and L1-5 vertebrae
Insertion: Femur
Innervation: ventral rami of L2-3 spinal nerves
Iliacus
Action: flexion of thigh
Origin: Ilium, sacrum
Insertion: femur
Innervation: femoral nerve
Psoas minor
Action: flexion of trunk
Origin: T12-L1 vertebral body and intervertebral disc
Insertion: hip bone
Innervation: ventral rami of L1 spinal nerve
Piriformis
Action: lateral rotation of thigh
Origin: sacrum
Insertion: femur
Innervation: ventral rami of L5-S2 spinal nerves
Ischiococcygeus
Action: contributes to pelvic floor, supports pelvic viscera
Origin: ischium
Insertion: coccyx and sacrum
Innervation: ventral rami of S4-5 spinal nerves
Levator ani
Action: contributes to pelvic floor, supports pelvic viscera, resists increased intra-abdominal pressure, constricts lower rectum and vagina
Origin: Pubis, tendinous arch, ischium
Insertion: coccyx, anococcygeal ligament, perineal body, midline viscera
Innervation: pudendal nerve, ventral rami of S2-3 spinal nerves
Rhomboid major and minor
Action: retration (adduction) and elevation of scapula
Origin: spinous process of T2-T5 vertebrae, spinous processes of C7-T1 vertebrae
Insertion: scapula
Innervation: dorsal scapular nerve
Serratus posterior superior
Action: elevation of ribs 2-5
Origin: spinous processes of C7-T3 vertebrae
Insertion: ribs 2-5
Innervation: ventral rami of T1-3 spinal nerves
Serratus posterior inferior
Action: depression of ribs 9-12
Origin: spinous processes of T11-L2
Insertion: ribs 9-12
Innervation: ventral rami of T10-11 spinal nerves and ventral rami of T12 spinal nerve
Spinalis part of erector spinae
Action: lateral flexion of vertebral column (unilateral), extension of vertebral column (bilateral)
Origin: spinous process of nuchal ligament
Insertion: spinous process and occipital bone
Innervation: dorsal rami of spinal nerves
Erector spinae
Action: lateral flextion and rotation of vertebral column and head (unilateral) and extension of vertebral column and head (bilateral)
Origin: Iliocostalis, longissimus, spinalis
Insertion: Iliocostalis, longissimus, spinalis
Innervation: dorsal rami of spinal nerves
Iliocostalis part of erector spinae
Action: lateral flexion of vertebral column (unilateral), extension of vertebral column (bilateral), depression of ribs
Origin: common origin in ribs
Insertion: ribs and transverse processes (cervical)
Innervation: dorsal rami of spinal nerves
Longissimus part of erector spine
Action: lateral flexion of vertebral column and rotation of head to same side (unilateral), extension of vertebral column (bilateral), depresses ribs
Origin: Iliac crest, dorsal sacrum, sacral and lumbar spinous processes, supraspinous ligament
Insertion: transverse processes, ribs, and mastoid process
Innervation: dorsal rami of spinal nerves
Biceps brachii
Action: Supination and flexion of forearm, flexion of arm (weak)
Origin: Scapula
Insertion: tendon-radius, aponeurosis-deep fascia
Innervation: musculocutaneous nerve
Subscapularis
Action: medial rotation of arm, holds head of humerus in glenoid cavity
Origin: scapula
Insertion: humerus
Innervation: upper and lower subscapular nerves
Rotator Cuff Muscles
Includes: supraspinatus, infraspinatus, teres minor, and subscapularis
Action: stabalize glenohumeral joint
Coracobrachialis
Action: Adduction and flexion of arm
Origin: Scapula
Insertion: Humerus
Innervation: musculocutaneous nerve
