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Gross Anatomy q4
muscles on this test
| Question | Answer |
|---|---|
| origin of splenius capitus insertion of splenius capitus | o:lower ligamentum nuchae, sp T1-3 i:mastoid process, adjacent occiputal bone |
| origin of splenius cervicis inseron of splenius cervicis | o:sp T3-6 i:tp C1-3 |
| actions of splenius muscles | u/l: laterally bend and rotate neck b/l: draw head back |
| superficial intrinsic back muscles | splenius capitus and cervicis |
| origin of iliocostalis lumborum insertion of iliocostalis lumborum | o: iliac crest, sacrum, thoracolumbar fascia i: angles of lower ribs |
| origin of iliocostalis thoracis insertion of iliocostalis thoracis | o: lower ribs i: angles uppeibs |
| origin of iliocostalis cervicis insertion of iliocostalis cervicis | o: upper ribs i: TP C4-6 |
| most lateral column of intermediate layer of intrinsic back muscles, arising from iliac crest- inserting on ribs | iliocostalis |
| origin of longissimus thoracis insertion of longissmus thoracis | o: sacrum, iliac crest, thoracolumbar fascia i: lower 10 ribs, TP of lumbar and thoracic vertebrae |
| origin of longissimus cervicis insertion of longissimus cervicis | o: TP upper thoracic vert i: TP cervical vert (up to C2) |
| origin of longissimu capitis insertion of longissimus capitis | o: TP upper thoracic, articular processes lower cervical i: mastoid process |
| intermediate column of intermediate layer of intrinsic back muscles | longissimus |
| origin of spinalis cervicis insertion of spinalis cervicis | o: sp lower thoracic vert i: sp upper thoracic vert |
| spinalis cervicis | often only scant fibers |
| spinalis capitis | considered part of semispinalis capitis |
| action of the erector muscles | b/l: extend column u/l: lateral flexion longissimus capitis extends and turns face to same side |
| origin of short rotators insertion of short rotators | o: TP i: SP one segment above |
| origin of long rotators insertion of long rotators | o: TP i: SP two segments above |
| origin of multifidus insertion of multifidus | o: TP i: SP two to five segments above |
| general origin of semispinalis general insertion of semispinalis | o: TP i: SP of vertebrae six or more segments above origin |
| Semispinalis Thoracis Semispinalis Cervicis Semispinalis Capitis | I: SP T1-4 I: SP C2-7 I: SP occipital bone |
| Area of interspinalis | between SP's of adjacent vertebrae, absent in thoracic area |
| Action of transversospinalis muscles | extend column, contralateral rotation |
| Area and action of interansversarii | between TPs of adjacent vertebrae, absent in most thoracic area, extends and ipsilaterally flexes the column |
| origin of rectus capitis posterior major insertion of " | o: SP of C2 i: occipital bone, inferior to inferior nuchal line |
| origin and insertion of rectus capitis posterior minor | o: posterior tubercle of C1 i: occipital bone medial to RCP major |
| origin and insertion of obliquus capitis inferior | o: SP C2 i: TP C1 |
| origin and insertion oobliq capitis superior | o: TP C1 i: occiputal bone near inferior nuchal line |
| action of suboccipital muscles | extend and ipsilaterally rotate head |
| innervation of suboccipital muscles | suboccipital nerve- posterior primary division of C1 |
| what are the borders of the suboccipital triangle | obliquus capitis inferior, obliquus capitis superior, rectus capitis posterior major |
| structures within subocciptal tiangle | suboccipital nerve, vertebral artery |
| origin insertion of SCM | o: sternal head: manubrium, clavicular head: medial clavice i:mastoid process of temporal bone |
| action innervation of SCM | a: extension of head, flexion of neck, ipsilateral flexion of head and neck, contralateral rotation of head and neck |
| origin insertion of scalenes | o: TP C3-6(ant) TP C2-7(middle) TP C4-6(posterior) i: 1st rib(ant & middle), 2nd rib(posterior) |
| innervation action of scalenes | C3-8 spinal nerves; flexion of head(ant), lateral flexion of neck(mid & post), elevate 1st rib in forced inspiration(mid), elevation of 2nd rib in forced inspiration(post) |
| Origin insertion on mylohyoid | O: mylohyoid line of mandible, I: mylohyoid raphe, body of hyoid |
| Action innervation of mylohyoid | CN V3 (mandibular n.), elevates hyoid, floor of mouth, tongue, for swallowing and speaking |
| Origin insertion of geniohyoid | O: inferior mental spine of mandible, I: body of hyoid |
| Action innervation of geniohyoid | C1 via hypoglossal (CN XII), pulls hyoid anterosuperiorly, shortens mouth floor, widens pharynx |
| Origin insertion of stylohyoid | O: styloid process of temporal bone, I: body of hyoid |
| Action innervation of stylohyoid | Stylohyoid branch of facial n. ( CN VII), elevates/ retracts hyoid, elongates floor of mouth |
| Origin insertion of digastric | O: digastric fossa of mandible (ant), mastoid notch of temporal (post), I: intermediate tendon to body and greater horn of hyoid |
| Action innervation of digastric | Nerve to mylohyoid (ant), digastric branch of facial n (CN VII) (post), depress mandible against resistance, elevate and steady hyoid during swallowing and speaking |
| Origin insertion of sternohyoid | O: manubrium and medial clavicle, I: body of hyoid |
| Action innervation of sternohyoid | C1-3 via ansa cervicalis, depresses hyoid after elevation during swallowing |
| Origin insertion of omohyoid | O: superior border of scapula near suprascapular notch, I: inferior border of hyoid |
| Action innervation of omohyoid | C1-3 via ansa cervicalis, depresses, retracts, steadies hyoid |
| Origin insertion of sternothyroid | O: posterior surface of manubrium, I: oblique line of thyroid cartilage |
| Action innervation of sternothyroid | C2-3 via ansa cervicalis, depresses hyoid and larynx |
| Origin insertion of thyrohyoid | O: oblique line of thyroid cartilage, I: inferior body of hyoid and greater horn of hyoid |
| Action innervation of thyrohyoid | C1 via hypoglossal n (CN XII), depress hyoid, elevate larynx |
Created by:
cooandrew
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