Superficial Back - learning objs Flashcards
(20 cards)
Latissimus Dorsi
- attachments: lower thoracic spinous processes, thoracolumbar fascia and iliac crest to the floor of the intertubercular sulcus of the humerus
- actions: adduction, extension, and medial rotation of humerus
- innervation: C6-8, thoracodorsal nerve
Levator Scapulae
- attachments: transverse processes of C1-4 to the superior angle and superomedial border of the scapula
- actions: elevation and downward rotation of the scapula
- innervation: C4-5, dorsal scapular nerve (sensory: direct branches of C3-4)
Pectoralis Major
- attachments: clavicle, costal cartilages, sternum and aponeurosis of the external oblique to the lateral lip of the intertubercular sulcus of the humerus
- actions: humeral adduction, flexion and medial rotation
- innervation: (clavicular head C5-7; sternocostal head C8-T1), lateral and medial pectoral nerves
Pectoralis Minor
- attachments: outer surfaces of ribs 3-5 to the coracoid process
- actions: anterior tilt of scapula, depression of the shoulder and forced inspiration
- innervation: C5-T1, medial and lateral pectoral nerves
Rhomboids
- attachments:
- major: spinous processes T2-5
- minor: ligamentum nuchae and C7-T1 to medial border of scapula
- actions: scapular retraction, elevation and downward rotation
- innervation C4-C5, dorsal scapular nerve (sensory: direct branches of C3-4)
Serratus anterior
- attachments: outer surfaces and superior borders of upper 8-10 ribs to the costal surface of the medial border of the scapula
- actions: scapular protraction and upward rotation
- innervations: C5-6, long thoracic nerve
Subclavius
- attachments: 1st rib cartilage to the undersurface of the clavicle
- actions: depresses and stabilizes the clavicle
- innervation: C5-6, subclavian nerve
Trapezius
- attachments: superior nuchal line, external protuberance, ligamentum nuchae, cervical and thoracic spinous processes to the clavicle, acromion and scapular spine
- actions: scapular elevation, depression, retraction, and upward rotation
- innervaion: accessory nerve (CN XI; motor) and C3-4 (sensory)
What is the difference btwn extrinsic and intrinsic muscles?
- extrinsic muscles are superficial and intermediate; provide limb movement and respiration
- intrinsic muscles are deep and provide vertebral column movement and stabilization
List the extrinsic (superficial & intermediate) back muscles
- superficial/axioappendicular layer: trapezius, latissimus dorsi, levator scapuale, rhomboids
- intermediate layer: serratus posterior superior, serratus posterior inferior
What rami are extrinsic innervated by?
anterior rami of spinal nerves
List the intrinsic (superficial, intermediate, deep) back muscles
- superficial layer: splenius capitis and splenius cervicis
- intermediate layer: erector spinalis, erector longissimus, erector iliocostalis
- deep layer: the transverspospinales: semispinalis multidus and semispinalis rotatores
What rami are intrinsic muscles innervated by?
posterior rami of spinal nerves
What anatomical structure is this?
external occipital protuberance
What anatomical structure is this?
spinous process of the seventh cervical vertebra (vertebra prominens)
Name the anatomical structures of the scapula
What anatomical structure is this?
spinous processes of thoracic vertebrae
What anatomical structure is this?
iliac crest of pelvis
What anatomical structure is this?
posterior superior iliac spine
Locate the areas of skin associated with a single spinal segment/nerve (dermatome)
C1 lacks a significant afferent component, so it is not pictured
