Loss of muscle mass from lack of activity is termed:

Choice A reason: Scoliosis is the correct answer. It is characterized by a lateral curvature of the spine, often diagnosed in adolescence. It can range from mild to severe and may require bracing or surgery depending on progression.

Choice B reason: Lordosis refers to an exaggerated inward curvature of the lumbar spine. It is a spinal deformity but not the most common.

Choice C reason: Kyphosis is an exaggerated outward curvature of the thoracic spine, leading to a hunched posture. It is less common than scoliosis.

Choice D reason: Osteosis is not a recognized spinal deformity. It may be a misused or fictional term.

Choice E reason: A slipped disc, or herniated disc, involves displacement of intervertebral disc material. It causes pain and nerve compression but is not classified as a spinal deformity.

Choice A reason: Supraspinatus is one of the four rotator cuff muscles. It originates from the supraspinous fossa of the scapula and inserts on the greater tubercle of the humerus, aiding in shoulder abduction and stabilization.

Choice B reason: Infraspinatus is a rotator cuff muscle that originates from the infraspinous fossa of the scapula and inserts on the greater tubercle of the humerus. It functions in external rotation of the shoulder.

Choice C reason: Rhomboid minor is not part of the rotator cuff. It is located in the upper back and functions to retract the scapula. It does not attach to the humerus or contribute to shoulder joint stabilization.

Choice D reason: Teres minor is a rotator cuff muscle that originates from the lateral border of the scapula and inserts on the greater tubercle of the humerus. It assists in external rotation and stabilization of the shoulder.

Choice E reason: Subscapularis is the fourth rotator cuff muscle. It originates from the subscapular fossa and inserts on the lesser tubercle of the humerus, functioning in internal rotation of the shoulder.