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기립근 중 첫번째 최장근 공부~~
capitis, cervicis, thoracis 세 부분으로 나뉨.
thoracis는 다시 lumbar portion과 thoracic portion으로 나뉨.
longissimus lumborum까지 해서 네 개로 보는 사람들도 있음.
spine extension, lateral flexion을 주로 담당하고 capitis는 head rotation도 담당.
| Origin | Longissimus capitis: Transverse processes of vertebrae C4-T5
Longissimus cervicis: Transverse processes of vertebrae T1-T5
Longissimus thoracis:
Lumbar part - Lumbar intermuscular aponeurosis, medial part of sacropelvic surface of ilium, Posterior sacroiliac ligament
Thoracic part - Spinous and transverse processes of vertebrae L1-L5, median sacral crest, posterior surface of sacrum and posterior iliac crest |
| Insertion | Longissimus capitis: Mastoid process of temporal bone
Longissimus cervicis: Transverse processes of vertebrae C2-C6
Longissimus thoracis:
Lumbar part - Accessory and transverse processes of vertebrae L1-L5
Thoracic part - Transverse process of vertebrae T1-T12, Angles of ribs 7-12 |
| Action | Entire muscle:
Bilateral contraction - Extension of spine
Unilateral contraction - Lateral flexion of spine (ipsilateral)
Longissimus capitis only:
Bilateral contraction - Extension of head and neck
Unilateral contraction - Lateral flexion and rotation of head (ipsilateral) |
| Innervation | Lateral branches of posterior rami of spinal nerves |
| Blood supply | Longissimus capitis and cervicis: vertebral artery, deep cervical artery, occipital artery, transverse cervical artery
Longissimus thoracis: superior intercostal, posterior intercostal and subcostal arteries; lateral sacral and median sacral arteries |
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capitis
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cervicis
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thoracis
아래쪽 lumbar part는 꽤나 두껍다
다른 기립근 칭긔칭긔들
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