WordNet

of or characteristic of low rank or importance
one of lesser rank or station or quality
having an orbit between the sun and the Earths orbit; "Mercury and Venus are inferior planets"
lower than a given reference point; "inferior alveolar artery"
of low or inferior quality
located at or near or behind a part or near the end of a structure
any of several muscles of the trunk (同)serratus muscles

PrepTutorEJDIC

(階級・親分・質・程度などが)『下の』,『劣る』, / (位置が)低い,下方の / 目下の者;劣った人
《名詞の前にのみ用いて》(生物学的に,位置が)後ろの,後部の / (時間・順序が)後の;(…より)後の《+『to』+『名』》(later) / しり(buttocks)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2017/02/01 10:23:17」(JST)

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The Serratus posterior inferior muscle (or posterior serratus) is a muscle of the human body.

Origin and insertion

The muscle lies at the junction of the thoracic and lumbar regions. The origin arises from the vertebrae T11 through L2. The muscle's insertion is the lower border of the 9th through 12th ribs.

It is situated at the junction of the thoracic and lumbar regions: it is of an irregularly quadrilateral form, broader than the serratus posterior superior muscle, and separated from it by a wide interval.

It arises by a thin aponeurosis from the spinous processes of the lower two thoracic and upper two or three lumbar vertebrae, and from the supraspinal ligament.

Passing obliquely upward and lateralward, it becomes fleshy, and divides into four flat digitations, which are inserted into the inferior borders of the lower four ribs, a little beyond their angles.

The thin aponeurosis of origin is intimately blended with the lumbodorsal fascia, and aponeurosis of the Latissimus dorsi.

Function

The serratus posterior inferior draws the lower ribs backward and downward to assist in rotation and extension of the trunk. This movement of the ribs also contributes to forced expiration of air from the lungs.

Additional images

Position of the serratus posterior inferior (shown in red). Animation.

Close up. The muscle arises from the vertebrae T11 through L2 and inserted into lower border of the 9th through 12th ribs.

Lumbar triangle

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

Anatomy figure: 01:05-04 at Human Anatomy Online, SUNY Downstate Medical Center - "Intermediate layer of the extrinsic muscles of the back, deep muscles."
Cross section image: pembody/body8a - Plastination Laboratory at the Medical University of Vienna

UpToDate Contents

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English Journal

Specific kinematics and associated muscle activation in individuals with scapular dyskinesis.

Huang TS1, Ou HL1, Huang CY1, Lin JJ2.
Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.].J Shoulder Elbow Surg.2015 Aug;24(8):1227-34. doi: 10.1016/j.jse.2014.12.022. Epub 2015 Feb 19.
BACKGROUND: Knowledge of the kinematics and associated muscular activity in individuals with scapular dyskinesis may provide insight into the injury mechanism and inform the planning of treatment strategies. We investigated scapular kinematics and associated muscular activation during arm movements
PMID 25704212

Multifidus Muscle Changes After Back Injury Are Characterized by Structural Remodeling of Muscle, Adipose and Connective Tissue, but Not Muscle Atrophy: Molecular and Morphological Evidence.

Hodges PW1, James G, Blomster L, Hall L, Schmid A, Shu C, Little C, Melrose J.
Spine.Spine (Phila Pa 1976).2015 Jul 15;40(14):1057-71. doi: 10.1097/BRS.0000000000000972.
STUDY DESIGN: Longitudinal case-controlled animal study.OBJECTIVE: To investigate putative cellular mechanisms to explain structural changes in muscle and adipose and connective tissues of the back muscles after intervertebral disc (IVD) injury.SUMMARY OF BACKGROUND DATA: Structural back muscle chan
PMID 25943090

Rates of Reconstruction Failure in Patients Undergoing Immediate Reconstruction With Tissue Expanders and/or Implants and Postmastectomy Radiation Therapy.

Fowble B1, Park C2, Wang F3, Peled A3, Alvarado M4, Ewing C4, Esserman L4, Foster R3, Sbitany H3, Hanlon A5.
International journal of radiation oncology, biology, physics.Int J Radiat Oncol Biol Phys.2015 Jul 1;92(3):634-41. doi: 10.1016/j.ijrobp.2015.02.031. Epub 2015 Apr 28.
OBJECTIVES: Mastectomy rates for breast cancer have increased, with a parallel increase in immediate reconstruction. For some women, tissue expander and implant (TE/I) reconstruction is the preferred or sole option. This retrospective study examined the rate of TE/I reconstruction failure (ie, remov
PMID 25936815

Japanese Journal

筋電図を用いた下後鋸筋の運動学的役割に関する検証:ケースレポート

ヘルスプロモーション理学療法研究 5(2), 91-95, 2015
NAID 130005097613

保存療法を行った肩鎖関節脱臼患者の挙上運動における肩甲骨周囲筋活動

肩関節 35(2), 645-648, 2011
NAID 130001413771

PHSにて修復した上腰ヘルニアの1例

日本臨床外科学会雑誌 = The journal of the Japan Surgical Association 70(12), 3713-3717, 2009-12-25
NAID 10026340493

「下後鋸筋」

Serratus posterior inferior muscle
	Muscles connecting the upper extremity to the vertebral column (serratus posterior inferior labeled at center right).
	Serratus posterior inferior (red) seen from back.
Details
Origin	Vertebrae: Spinous processes of T11 - L2
Insertion	The inferior borders of the 9th through 12th ribs
Artery	Intercostal arteries
Nerve	Intercostal nerves T9 through T12
Actions	Depress the lower ribs, aiding in expiration
Identifiers
Latin	Musculus serratus posterior inferior
TA	A04.3.01.010
FMA	13402
	Anatomical terms of muscle [edit on Wikidata]