Musculus pectoralis descendens
The superficial descending pectoral is the most superficial pectoral muscle. It originates from the cranial sternum and manubrium and inserts on the deltoid tuberosity and crest of the humerus. Its actions are to adduct the forelimb and advance the trunk over the planted limb. It is innervated by the cranial pectoral nerves (roughly C7-C8). It is visible as the muscular chest between the forelegs.
Origin: Cranial sternum and manubrium
Insertion: Deltoid tuberosity and crest of the humerus
Action: Adducts the forelimb; advances the trunk over the planted limb
Innervation: Cranial pectoral nerves (C7-C8)
Isolated injury is uncommon. Relevant in evaluations of pectoral trauma or after falls.
## Overview Pectoral bruising from the girth occurs when a poorly fitted or overly tight girth compresses the pectoral muscles behind the elbow. It causes girth sores, reluctance to be girthed, a sho
Swelling or pain between the forelegs after trauma should be evaluated.
## Overview Pectoral bruising from the girth occurs when a poorly fitted or overly tight girth compresses the pectoral muscles behind the elbow. It causes girth sores, reluctance to be girthed, a shortened forelimb stride, and behavioral resistance during saddling. ## Causes Girth placed too far forward or fastened too tightly. ## Diagnosis Visual sores or swelling in the girth area and improvement when girth fit is corrected. ## Treatment Rest from riding, wound care for sores, and refitting the girth or using a girth cover. Ensure the girth sits in the natural girth groove. ## Recovery and Prognosis Excellent once pressure is removed. ## Prevention Proper girth fit and gradual tightening. Signs include: girth sores behind the elbow; reluctance to girth up; shortened forelimb stride; swelling in the girth area
Isolated injury is uncommon. Relevant in evaluations of pectoral trauma or after falls.
Swelling or pain between the forelegs after trauma should be evaluated.
See the Superficial Descending Pectoral on our interactive 3D horse model. Open 3D Model