Muscle Innervation - Upper Limb

Explanation
The deltoid muscle is innervated by the axillary nerve, which is a branch of the brachial plexus. The axillary nerve passes through the axilla (armpit) before reaching the deltoid muscle. This nerve is responsible for providing motor innervation to the deltoid muscle, allowing it to contract and perform movements such as abduction and flexion of the shoulder joint. Therefore, the axillary nerve and axillary region are closely associated with the deltoid muscle.

Explanation
The answer is suprascapular, suprascapular nerve. The supraspinatus muscle is innervated by the suprascapular nerve, which originates from the superior trunk of the brachial plexus. The suprascapular nerve passes through the suprascapular notch, located on the superior border of the scapula, before reaching the supraspinatus muscle. Therefore, the suprascapular nerve is responsible for supplying motor innervation to the supraspinatus muscle.

Explanation
The subscapularis muscle is innervated by the subscapular nerve, which is also known as the superior subscapular nerve. Therefore, the answer is subscapular nerve, superior subscapular nerve, superior subscapular.

Explanation
The given answer consists of four terms: inferior subscapular nerve, axillary nerve, axillary, and inferior subscapular. These terms are related to the anatomy of the shoulder region. The inferior subscapular nerve is a branch of the brachial plexus that innervates the teres major muscle. The axillary nerve also arises from the brachial plexus and innervates the deltoid and teres minor muscles. The axillary region refers to the armpit area, and the inferior subscapular muscle is one of the muscles located in this region. Therefore, the given answer is a list of anatomical structures and nerves associated with the shoulder region.

Explanation
The correct answer is "thoracodorsal nerve, thoracodorsal." The latissimus dorsi muscle is innervated by the thoracodorsal nerve, also known as the middle subscapular nerve. This nerve arises from the posterior cord of the brachial plexus and supplies motor innervation to the latissimus dorsi muscle. The thoracodorsal nerve travels through the axilla and enters the latissimus dorsi muscle, allowing it to contract and perform movements such as shoulder extension, adduction, and medial rotation. Therefore, the thoracodorsal nerve is responsible for innervating the latissimus dorsi muscle.

Explanation
The musculocutaneous nerve innervates the coracobrachialis muscle. It is a branch of the brachial plexus and supplies motor innervation to the muscles in the anterior compartment of the arm, including the coracobrachialis. The musculocutaneous nerve also provides sensory innervation to the lateral aspect of the forearm through its cutaneous branches. Therefore, the musculocutaneous nerve is responsible for both the motor and sensory functions related to the coracobrachialis muscle.

Explanation
The given answer "median nerve, median" suggests that the thenar muscles are innervated by the median nerve. The thenar muscles are a group of muscles located at the base of the thumb, responsible for its movement and function. The median nerve is a major nerve that runs down the arm and passes through the wrist, supplying sensation and motor control to the thumb, index finger, middle finger, and half of the ring finger. Therefore, it is logical to conclude that the thenar muscles, being located in the thumb region, are innervated by the median nerve.

Explanation
The term "rhomboids" refers to a group of muscles located in the upper back. These muscles are innervated by the dorsal scapular nerve, which is responsible for providing motor innervation to the rhomboids. The dorsal scapular nerve originates from the brachial plexus and travels to the rhomboids, along with the dorsal scapular artery and vein, through the deep muscles of the neck. This nerve is essential for the proper functioning of the rhomboid muscles, allowing for movements such as retraction and downward rotation of the scapula.

Explanation
The answer "ulnar nerve, ulnar" suggests that FCU stands for the ulnar nerve, specifically the ulnar nerve that innervates the ulnar muscles. This could be a medical abbreviation or acronym used to refer to this specific nerve and its related structures.

Explanation
The ulnar nerve is responsible for innervating the intrinsic muscles of the hand. This nerve runs along the ulnar side of the forearm and passes through the Guyon's canal to reach the hand. Once in the hand, it branches out to supply the muscles that control fine movements of the fingers and thumb, such as gripping and pinching. Therefore, the ulnar nerve is closely associated with the intrinsic muscles in the hand.

Explanation
The given answer "ulnar nerve, ulnar" is correct because the term "medial 1/2 FDP" refers to the medial half of the flexor digitorum profundus muscle. The ulnar nerve is responsible for innervating the ulnar side of the hand and the ulnar aspect of the flexor digitorum profundus muscle. Therefore, when the medial half of the flexor digitorum profundus muscle is mentioned, it is most likely referring to the ulnar nerve and the ulnar side of the hand.

Explanation
The question is asking for the two lateral lumbrical muscles. The correct answer is the median nerve and the median. This suggests that the two lateral lumbrical muscles are innervated by the median nerve and are located within the median region of the body.

Explanation
The dorsal scapular nerve innervates the levator scapulae muscle. It originates from the C5 nerve root and travels through the middle scalene muscle to reach the levator scapulae. The dorsal scapular nerve also supplies the rhomboid muscles. Therefore, the correct answer is the dorsal scapular nerve and dorsal scapular.