The Torso Region: Muscles

Trapezius

Upper back muscle Extends from the clavicle over the shoulder to the lumbar region Also extends from the shoulders "up" the neck to the occipital region of the skull

What is the major superficial upper back muscle and what is the major superficial lower back muscle?

Upper: Trapezius Lower: Latissimus dorsi

Internal oblique

Deep to the external oblique Extends from the latissimus dorsi and wraps around the abdomen to the anterior side forming a sheath that splits so part of the sheath covers the anterior portion of the rectus abdominis and part covers the posterior portion of the rectus abdominis

Transversus abdominis

Deep to the internal oblique Extends from the latissimus dorsi and wraps around the abdomen forming a sheath that covers the posterior portion of the rectus abdominis

Iliocostalis thoracis

Elongated muscle lateral to the longissimus thoracis

Longissimus thoracis

Elongated muscle lateral to the spinalis thoracis

Spinalis thoracis

Elongated muscle nearest the spinal column

The anterior wall and the posterior wall of the rectus sheath envelop what abdominal muscle?

Envelops the rectus abdominus

Erector spinae muscles

Group of muscles deep to the latissimus dorsi and trapezius

On what bone does the pectoralis major muscle insert?

Humerus

What structure of the humerus does the latissimus dorsi attach to?

Intertubercular sulcus

External oblique

Lateral muscle of the abdomen Extends from the latissimus dorsi muscle around to the anterior side forming a sheath that covers the rectus abdominis muscle

Latissimus dorsi

Lower back muscle Covers most of the lumbar region Extends from the lumbar region and curves around the anterior side to insert in the area intertubercular groove

Pectoralis major

Major chest muscles of the anterior thoracic region

Rectus abdominis

Muscles of the abdomen that form two vertical columns - Segmented - Ensheathed in the rectus sheath - Each segment is divided by distinct, transverse tendinous material called the tendinous inscriptions - Linea alba: Sheath of the left rectus abdominis and the sheath of the right rectus abdominis form vertical dense tissue

There are two teres muscles. One is part of the rotator cuff muscles and one is not. What are their names?

Part: Teres minor Not part: Teres major

Anterior torso muscles consist of:

Pectoralis major Rectus abdominalis External oblique Internal oblique Transversus abdominis

Identify the muscle that is enclosed by the anterior and posterior rectus sheath

Rectus abdominus

Lateral to the pectoralis major muscle (near the axilla region) is the XXX muscle.

Serratus anterior

Name the erector spinae muscles from medial to lateral

Spinalis thoracis Longissimus thoracis Iliocostalis thoracis

What is the name of the transverse connective tissue that "divides" the segments of the rectus abdominis muscle?

Tendinous intersections

Which muscle is NOT part of the rotator cuff?

Teres major

Which is the most lateral erector spinae muscle?

The iliocostalis thoracis

What muscle forms part of both the anterior and posterior sheath that encloses the rectus abdominis muscle?

The internal oblique

What muscle is associated with the thoracolumbar fascia?

The latissimus dorsi

What is the name of the vertical connective tissue that "divides" the rectus abdominis muscle?

The linea alba

What muscle connects to the lateral edges of the sternum?

The pectoralis major

The iliopsoas extends into the abdomen and is made of two muscles: psoas major and iliacus. Which extends farther into the abdomen?

The psoas major

The tendinous intersections are located on the surface of the XXX muscle?

The rectus abdominis

Which muscle is more superior in the upper back?

The rhomboid minor

What is the major superficial muscle of the upper back?

The trapezius

What is the deepest of the muscles listed? Transversus abdominis External oblique Internal oblique

Transversus abdominis External oblique Internal oblique

Posterior torso muscles consist of:

Trapezius Latissimus dorsi Erector spinae muscles - Spinalis thoracic - Longissimus thoracic - Iliocostalis thoracic