Rotator Cuff muscles and Brachial Plexus

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38 Questions

Which muscle is responsible for medial rotation of the shoulder joint?

Subscapularis

Which muscle is responsible for lateral rotation of the shoulder joint?

Infraspinatus

Which muscle is responsible for abduction of the shoulder joint?

Supraspinatus

Which muscle is responsible for extension of the shoulder joint?

Teres Major

Which muscle is NOT responsible for adduction of the shoulder joint?

Subscapularis

Which nerve innervates the Supraspinatus muscle?

Suprascapular Nerve

Which nerve innervates the Infraspinatus muscle?

Suprascapular Nerve

Which nerve innervates the Teres Minor muscle?

Axillary Nerve

Which nerve innervates the Subscapularis muscle?

Upper and Lower Subscapular Nerves

Which muscle is responsible for lateral rotation of the shoulder joint?

A & C

Which muscles are supplied by the anterior divisions of the trunks of the brachial plexus?

Flexor compartments

Where does the brachial plexus begin?

In the neck

What is the function of the brachial plexus?

To supply the upper limb

Which structures are formed by the divisions of the trunks of the brachial plexus?

Lateral, medial, and posterior cords

What divides the brachial plexus into supraclavicular and infraclavicular parts?

Clavicle

Which nerves are included in the infraclavicular part of the brachial plexus?

Musculocutaneous nerve, axillary nerve, and radial nerve

Where do the roots of the brachial plexus pass through?

Gap between the anterior and middle scalene muscles

Which nerves are included in the terminal branches of the brachial plexus?

Musculocutaneous nerve, axillary nerve, radial nerve, median nerve, and ulnar nerve

What forms the brachial plexus?

Union of the anterior rami of C5-C8 and T1

What are the three trunks formed by the roots of the brachial plexus?

Superior, middle, and inferior trunks

The anterior deltoid muscle is responsible for ______ of the shoulder joint (list 2 actions)

flexion and medial rotation

The posterior deltoid muscle is responsible for ______ of the shoulder joint. (list 2 actions)

extension and lateral rotation

The entire deltoid muscle is responsible for ______ of the shoulder joint. (list 1 action - hint --> major movement of this muscle)

abduction

The infraspinatus muscle is responsible for ______ of the shoulder joint (list 2 actions)

lateral rotation and horizontal abduction

The subscapularis muscle is responsible for ______ of the shoulder joint

medial rotation

Each trunk divides into ______ divisions as the plexus passes posterior to the clavicle.

anterior and posterior

The posterior divisions of the trunk supply the ______ compartments of the upper limb

extensor or posterior

The divisions of the trunks form ____cords of the brachial plexus

3

The supraclavicular part gives rise to four branches, including the dorsal scapular nerve and the ______. (name 1 or more)

suprascapular nerve, Long thoracic nerve, Nerve to subclavius

The infraclavicular part gives rise to branches from the cords of the brachial plexus, including the ______ nerve, axillary nerve, and radial nerve.

musculocutaneous

The infraspinatus inserts onto the...

Teres Minor inserts onto the...

Subscapularis inserts onto..

Teres Major inserts onto..

The lateral border of the scapula give rise to 2 muscles-->....

List two muscles that can perform extension of the shoulder (from rotator cuff lecture)

List 2 muscles that can perform lateral rotation

The entire deltoid muscle originates from 3 different structures. Name them

Study Notes

Anatomy of the Brachial Plexus and Shoulder Girdle Muscles

  • The brachial plexus is a major nerve that supplies the upper limb and begins in the neck and extends into the axilla.
  • It is formed by the union of the anterior rami of C5-C8 and T1.
  • The roots of the plexus pass through the gap between the anterior and middle scalene muscles in the neck.
  • The roots unite in the inferior part of the neck to form three trunks: superior, middle, and inferior.
  • Each trunk divides into anterior and posterior divisions as the plexus passes posterior to the clavicle.
  • The anterior divisions of the trunk supply the anterior (flexor) compartments of the upper limb, while the posterior divisions supply the posterior (extensor) compartments.
  • The divisions of the trunks form three cords of the brachial plexus: lateral, medial, and posterior.
  • The brachial plexus forms multi-segmental peripheral nerves that are named and supply different parts of the upper limb.
  • The brachial plexus is divided into supraclavicular and infraclavicular parts by the clavicle.
  • The supraclavicular part gives rise to four branches, including the dorsal scapular nerve and the suprascapular nerve.
  • The infraclavicular part gives rise to branches from the cords of the brachial plexus, including the musculocutaneous nerve, axillary nerve, and radial nerve.
  • The terminal branches of the brachial plexus include the musculocutaneous nerve, axillary nerve, radial nerve, median nerve, and ulnar nerve.

Anatomy of the Brachial Plexus and Shoulder Girdle Muscles

  • The brachial plexus is a major nerve that supplies the upper limb and begins in the neck and extends into the axilla.
  • It is formed by the union of the anterior rami of C5-C8 and T1.
  • The roots of the plexus pass through the gap between the anterior and middle scalene muscles in the neck.
  • The roots unite in the inferior part of the neck to form three trunks: superior, middle, and inferior.
  • Each trunk divides into anterior and posterior divisions as the plexus passes posterior to the clavicle.
  • The anterior divisions of the trunk supply the anterior (flexor) compartments of the upper limb, while the posterior divisions supply the posterior (extensor) compartments.
  • The divisions of the trunks form three cords of the brachial plexus: lateral, medial, and posterior.
  • The brachial plexus forms multi-segmental peripheral nerves that are named and supply different parts of the upper limb.
  • The brachial plexus is divided into supraclavicular and infraclavicular parts by the clavicle.
  • The supraclavicular part gives rise to four branches, including the dorsal scapular nerve and the suprascapular nerve.
  • The infraclavicular part gives rise to branches from the cords of the brachial plexus, including the musculocutaneous nerve, axillary nerve, and radial nerve.
  • The terminal branches of the brachial plexus include the musculocutaneous nerve, axillary nerve, radial nerve, median nerve, and ulnar nerve.

Explore the anatomy of the brachial plexus, a major nerve supplying the upper limb, and its relation to the shoulder girdle muscles. Learn about the formation, divisions, and branches of the brachial plexus along with its role in supplying different parts of the upper limb.

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