Superficial Back Muscles
Order by
21 terms
Terms | Definitions |
|---|---|
 Trapezius Muscle | Extrinsic Back Muscle Origin: along midline between the external occipital protuberance and spinous process of T12 Insertion: all fibers run laterally to the scapular spine Innervated By: spinal accessory nerve (cranial nerve XI) Function: moves and controls the scapula |
| Superior Fibers of the Trapezius Muscle | originate from the occipital bone and cervical spine Function: elevation of the scapula |
| Middle Fibers of the Trapezius Muscle | run horizontally from the upper thoracic spine Function: retraction of the scapula |
| Inferior Fibers of the Trapezius Muscle | originate from the lower thoracic spine Function: depression of the scapula and inferior rotation of the glenohumeral joint |
| Latissimus Dorsi Muscle | Extrinsic Back Muscle Origin: broad thoracolumbar fascia and the medial aspects of the iliac crests Insertion: a single point on the neck of the humerus Innervated By: thoracodorsal nerve (C6-8), which runs vertically along its surface Function: pennate muscle that pulls the shoulder into adduction and slightly into extension |
| Thoracolumbar Fascia | Inferior Anchor: bilaterally to the medial aspects of the iliac crest and dorsal aspect of the sacrum Lateral Anchor: along the midline to the spinous processes of the sacrum Superior Anchor: spinous process of T6 Function: several muscles connect with it Notes: develops into 3 layers - posterior, middle, and anterior |
| Thoracodorsal Nerve | C6-C8 Function: innervates the latissimus dorsi muscle |
| Lumbar Triangle | Bounded By: latissimus dorsi muscle, external abdominal oblique, and iliac crest Importance: common site for lumbar herniation |
| External Abdominal Oblique | Origin: lower ribs (5-12) Insertion: iliac crest lateral to the origin of the latissimus dorsi Innervated By: thoracoabdominal nerves (T7-T11) and subcostal nerve Notes: connected to the thoracolumbar fascia |
| Nuchal Ligament | Origin: external occipital protuberance Insertion: T2/T3 spinous process Function: provides an attachment site for the muscles that attach to the spinous processes of vertebrae |
| Greater Occipital Nerve | Origin: dorsal ramus of spinal nerve C2 Function: cutaneous innervation of the skin, not the muscles that it passes through |
| Spinal Accessory Nerve (Cranial Nerve XI) | Origin: exits the skull Innervates: travels beneath the sternocleidomastoid muscle to trapezius and innervates them both |
| Levator Scapulae Muscle | Origin: transverse Process of C1-C4 Insertion: superiormedial border of the scapula Innervated By: ventral rami of C3-C5, particularly C5 (dorsal scapular nerve) Function: allows the scapula to rotate upward (lifting an axe), elevates the scapula) Notes: deep to the trapezius and latissimus dorsi and superior to rhomboid minor and major |
| Rhomboid Major Muscle | Origin: spinous process of T2-T5 Insertion: medial border of the scapula, immediately inferior to the levator scapulae muscle Innervated By: dorsal scapular nerve (C5) Function: allows the scapula to rotate downward (using an axe), retraction of the scapula Notes: runs inferolaterally, inferior to the rhomboid minor muscle, acts as a single muscle |
| Rhomboid Minor Muscle | Origin: nuchal ligament and spinous process of C7-T1 Insertion: medial border of the scapula, immediately inferior to the levator scapulae muscle Innervated By: dorsal scapular nerve (C5) Function: allows the scapula to rotate downward (using an axe), retraction of the scapula Notes: runs inferolaterally, superior to rhomboid major, acts as a single muscle |
| Deep Fascia | lends structure to the body through its interconnectedness. fascia is thought to be a continuous structure (the body is a unit). fascial restriction in one area may result in pain in another. encloses the intrinsic back muscles. |
| Supraspinous Ligament | thin, cord-like, anchors tips of adjacent spinous processes to each other, but does not strongly connect them to the pelvis. continuous with the thoracolumbar fascia. expands to form the nuchal ligament (ligamentum nuchae). |
| Serratus Posterior Inferior Muscle | Origin: spinous process of T11-L2 Insertion: runs laterally to the last three or four ribs near the costal angle Innervated By: intercostal nerves T8-T11 Notes: just deep to the latissimus dorsi muscle |
| Intercostal Nerves | anterior divisions (rami anteriores; ventral divisions) of the thoracic spinal nerves from T1-T11 |
| Dorsal Scapular Nerve | nerve of the ventral rami (C5) that innervates the levator scapulae muscle. it runs deep to the levator scapulae muscle and rhomboid muscles and medial to their attachment to the scapula. |
| Serratus Posterior Superior Muscle | Origin: aponeurosis from the nuchal ligament and spinous processes of C7-T2 Insertion: costal angles of ribs 2-5 Innervated By: ventral rami of spinal nerves T1-T4 |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.