**Question:** Deltoid muscle causes all EXCEPT:-

A. Shoulder joint abduction
B. Elbow joint flexion
C. Wrist joint extension
D. Ankle joint dorsiflexion

**Core Concept:**
The deltoid muscle is a large, triangular-shaped muscle located on the anterior and posterior aspects of the upper arm. It is responsible for shoulder movement, particularly abduction, flexion, and internal rotation. The deltoid muscle arises from three different points: the coracoid process, the acromion process, and the spine of the scapula.

**Why the Correct Answer is Right:**
Deltoid muscle primarily acts on the glenohumeral joint, which is responsible for shoulder movements. It causes abduction, flexion, and internal rotation of the shoulder joint.

The correct answer is not mentioning any movement related to the shoulder joint, thus making it the right answer.

**Why Each Wrong Option is Incorrect:**

A. Shoulder joint abduction: Abduction is a shoulder joint movement that is a result of deltoid muscle action. So, option A is incorrect as the deltoid muscle does cause abduction.

B. Elbow joint flexion: The deltoid muscle does not have any direct involvement in elbow joint movements. Therefore, option B is incorrect.

C. Wrist joint extension: The deltoid muscle does not contribute to wrist joint movements. Thus, option C is incorrect.

D. Ankle joint dorsiflexion: The deltoid muscle is not involved in ankle joint movements. Consequently, option D is incorrect.

**Clinical Pearl:**
Understanding the role of muscles in joint movements is crucial to appreciate the complex interplay between various muscle groups and their contribution to overall limb function. Adequate knowledge of these muscle functions is essential for accurate diagnosis and treatment planning in clinical practice.