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''from Latin: pectus - chest'' | ''from Latin: pectus - chest'' | ||
==Definition== | ==Definition== | ||
The '''pectoralis minor muscle''' is a thin, triangular [[ | The '''pectoralis minor muscle''' is a thin, triangular [[Corpus:Muscle|muscle]] located on the upper part of the bony [[Corpus:Thorax|thorax]], directly beneath the [[Corpus:Pectoralis major muscle|pectoralis major muscle]]. It is one of the outer pectoral muscles that connect the ventral [[Corpus: Shoulder|shoulder]] girdle to the [[Corpus: Trunk|trunk]].<dcembed ratio="16x9"><dcEmbedUrl src="https://www.doccheck.com/de/detail/photos/42895-musculus-pectoralis-minor"></dcEmbedUrl></dcembed> | ||
==Course== | ==Course== | ||
The pectoralis minor muscle originates from the upper edges or ventral surfaces of the third, fourth, and fifth [[ | The pectoralis minor muscle originates from the upper edges or ventral surfaces of the third, fourth, and fifth [[Corpus: Rib|ribs]], as well as the [[Corpus:Aponeurosis|aponeuroses]] covering the [[Corpus:Intercostal space|intercostal spaces]] between them. The muscle fibers extend cranially and laterally, converging to form a flat [[Corpus:Tendon|tendon]] that attaches to the medial edge and cranial surface of the [[Corpus: Coracoid process|coracoid process]] of the [[Corpus: Scapula|scapula]]. | ||
<dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/b9b7d0815a254c149a039f16cb9b675c" ui_controls="1"></dcembedurlskatchfab></dcembed> | <dcembed><dcembedurlskatchfab src="https://sketchfab.com/3d-models/b9b7d0815a254c149a039f16cb9b675c" ui_controls="1"></dcembedurlskatchfab></dcembed> | ||
==Innervation== | ==Innervation== | ||
The pectoralis minor muscle is innervated by the [[ | The pectoralis minor muscle is innervated by the [[Corpus: Medial pectoral nerve|medial pectoral nerve]] (C8-Th1) and the [[Corpus: Lateral pectoral nerve|lateral pectoral nerve]] (C5-C7) from the [[Corpus: Brachial plexus|brachial plexus]]. | ||
==Blood supply== | ==Blood supply== | ||
Arterial blood is supplied to the pectoralis minor muscle by muscular branches of the [[ | Arterial blood is supplied to the pectoralis minor muscle by muscular branches of the [[Corpus: Superior thoracic artery|superior thoracic artery]] and the pectoral branch of the [[Corpus: Thoracoacromial artery|thoracoacromial artery]]. Venous blood is drained through the [[Corpus:Pectoral veins|pectoral veins]] into the [[Corpus: Subclavian vein|subclavian vein]]. | ||
==Function== | ==Function== |
Aktuelle Version vom 21. August 2024, 13:32 Uhr
from Latin: pectus - chest
Definition
The pectoralis minor muscle is a thin, triangular muscle located on the upper part of the bony thorax, directly beneath the pectoralis major muscle. It is one of the outer pectoral muscles that connect the ventral shoulder girdle to the trunk.
Course
The pectoralis minor muscle originates from the upper edges or ventral surfaces of the third, fourth, and fifth ribs, as well as the aponeuroses covering the intercostal spaces between them. The muscle fibers extend cranially and laterally, converging to form a flat tendon that attaches to the medial edge and cranial surface of the coracoid process of the scapula.
Innervation
The pectoralis minor muscle is innervated by the medial pectoral nerve (C8-Th1) and the lateral pectoral nerve (C5-C7) from the brachial plexus.
Blood supply
Arterial blood is supplied to the pectoralis minor muscle by muscular branches of the superior thoracic artery and the pectoral branch of the thoracoacromial artery. Venous blood is drained through the pectoral veins into the subclavian vein.
Function
The pectoralis minor muscle functions to pull the scapula obliquely downward, moving it caudally, medially, and ventrally. When the arms are fixed, such as when propped up, the pectoralis minor acts as an auxiliary respiratory muscle, aiding in breathing along with the pectoralis major muscle.