Chest Muscles

MUSCLES OF CHEST

The thorax is located in the upper trunk, defined anteriorly by the sternum bone, laterally by the ribs, and later by the spine.

The chest muscles are structured in 2 regions:

  • Anterolateral Region
  • Costal Region
Anterolateral Region Costal Region
Greater Breastplate
Minor Breastplate
Previous Serratile
Subclavian
External Intercostals
Internal Intercostals
Rib Lifters
Subcostals
Chest Transverse

 

Anterolateral Region

1. LARGEST CHEST

Greater Pectoral MuscleMedial Insertion: 1/2 medial of the anterior border of the clavicle, anterior face of the sternum, external face of the 1st to 6th costal cartilage and aponeurosis of the external oblique of the abdomen.

Lateral Insertion: Greater Tuber Crest

Innervation: Lateral Pectoral Nerve and Medial Pectoral Nerve (C5 & #8211; T1)

Action: Adduction, Medial Rotation, Shoulder Flexion and Horizontal Flexion

 

2. LOWER CHEST

IMinor Pectoral MuscleHigher Insert: Coracoid Process

Lower Insertion: External face of 3rd, 4th and 5th ribs

Innervation: Medial Pectoral Nerve (C8 & #8211; T1)

Action:

* Chest FixedShoulder Depression and Lower Scapular Rotation

* Fixed on the shoulder blade: Raises the Ribs (inspirational action)

 

3. PREVIOUS SERRABLE

Upper Portion:
Posterior Insertion: Upper angle of the scapula,Anterior Serratus Muscle
Previous Insert: Outer face of 1st and 2nd ribs
Medium Portion:
Posterior Insertion: Medial border of the scapula
Previous Insert: External face of 2nd to 4th ribs

Lower Portion:
Posterior Insertion: Lower angle of the scapula

Previous Insert: Outer face of 5th to 9th ribs

Innervation: Long Thoracic Nerve (C5 & #8211; C7)

Action:
* Fixed on the shoulder blade: Inspirational Action
* Fixed Ribs: Superior Rotation, Abduction and Depression of the Scapula and Shoulder Propulsion
Subclavian muscle

4. SUBCLASS

Lateral Insertion: Lower Clavicle Face

Medial Insertion: 1st rib and costal cartilage

Innervation: Subclavian Nerve (C5 & #8211; C6)

Action: Clavicle and Shoulder Depression

 

Costal Region

1. INTERNAL INTERCOSTAL

Superior Insertion: Lower edge of the overlying rib (upper)

Lower Insertion: Upper edge of the infrared rib (lower)

Innervation: Corresponding intercostal nerves

Action: Rib Depression (Expiratory Action)

 

2. EXTERNAL INTERCOSTALS

Superior Insertion: Lower edge of the overlying rib (upper)

Lower Insertion: Upper edge of the infrared rib (lower)

Innervation: Corresponding intercostal nerves

Action: Rib Elevation (Inspiratory Action)

The internal and external intercostal muscles intersect in ΔX38220; The fibers of the external intercostals run from upper to lower and from posterior to anterior. The fibers of the internal intercostals are directed from upper to lower and from anterior to posterior.

Intercostal muscles Intercostal muscles

 

Rib Lifter Muscles3. RIB LIFTERS

Superior Insertion: Transverse process of the 7th cervical vertebra to the 11th thoracic

Lower Insertion: External face of 1st to 12th rib

Innervation: Corresponding intercostal nerves

Action: Rib Elevation (Inspiratory Action) and Intercostal Stabilization

 

 

 

 

Subcostal muscles

4. SUBCOSTALS

Superior Insertion: Internal face of the overlying rib

Lower Insertion: Internal face of the 2nd or 3rd infrared rib

Innervation: Corresponding intercostal nerves

Action: Intercostal Stabilization

 

 

 

5Transverse Chest Muscle. Chest Transverse (STERNAL TRIANGULAR)

Upper Insertion: Internal face of sternum

Lower Insertion: Inner Face of 2nd to 6th Costal Cartilage

Innervation: Corresponding intercostal nerves

Action: Stabilization of the antero-inferior part of the chest

 

 

 

Thorax Muscles
Previous View & #8211; Superficial Dissection
 Chest Muscle - Superficial View
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Thorax Muscles
Previous View & #8211; Deep Dissection
Chest Muscle - Deep View
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
Thorax Muscles
Internal view
Chest Muscle - Internal View
Source: NETTER, Frank H .. Atlas of Human Anatomy. 2 ed. Porto Alegre: Artmed, 2000.
 Other Muscle Groups
Face

ATM

Neck

Abdomen

Back

Superior Member

Lower member

 

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