The document discusses the deltoid muscle. It is a triangular muscle located on the upper arm and shoulder. The deltoid has three portions - the anterior, middle, and posterior deltoid. Each portion has a different origin point on either the clavicle, acromion process, or scapula, but all portions converge to a single insertion point on the humerus. Each portion is also responsible for a different movement, such as flexion, abduction, or extension of the arm.

1. ORIGIN INSERTION AND MOVEMENT
OF
Deltoid Muscle
BY-:
AZHAR HUSSAIN ANSARI

2. INTRODUCTION
• The deltoid muscle is a rounded, triangular
muscle located on the uppermost part of the arm
and the top of the shoulder. It is named after the
Greek letter delta, which is shaped like an
equilateral triangle. The deltoid is attached by
tendons to the skeleton at the clavicle
(collarbone), scapula (shoulder blade), and
humerus (upper arm bone).

3. • The deltoid is widest at the top of the
shoulder and narrows to its apex as it
travels down the arm. Contraction of the
deltoid muscle results in a wide range of
movement of the arm at the shoulder due
to its location and the wide separation of
its muscle fibers.

4. • A study of 30 shoulders revealed an
average mass of 191.9 grams (6.77 oz) in
humans, ranging from 84 grams (3.0 oz) to
366 grams (12.9 oz).in Humans.

5. Structure
• The deltoid muscle
is divided into three
portions: anterior,
middle, and
posterior.

6. anterior deltoid
• Anterior means front and therefore the anterior
deltoid is the part of the deltoid at the front of
your shoulder. This part of the deltoid attaches to
your collarbone.

7. ORIGINE
• Anterior part of
deltoid (arises from
most of the anterior
border and upper
surface of the lateral
third of the clavicle.

8. Insertion
• Fibres from all heads
converge to insert into
the deltoid tuberosity
on the humerus

9. MOVEMENT
• flexes the arm at the
shoulder, internally
rotates the arm at the
shoulder joint, and
assists in taking the
arm out to the side
(abduction).

10. medial deltoid
• The middle deltoid is the middle part of the
deltoid and attaches to your shoulder blade.

11. ORIGINE
• Lateral part of deltoid
(arises from the
superior surface of
the acromion
process.)

12. Insertion
• Fibres from all heads
converge to insert into
the deltoid tuberosity
on the humerus

13. MOVEMENT
• abducts the arm at the shoulder joint

14. Posterior Deltoid
• The Posterior Deltoid is the back part of the
deltoid.this attatch to the shoulder blade

15. ORIGINE
Posterior part of
deltoid (arises from
the lower lip of the
posterior border of the
spine of the scapula.)

16. Insertion
• Fibres from all heads
converge to insert into
the deltoid tuberosity
on the humerus

17. MOVEMENT
• does
extension/hyperexten
sion of the arm at the
shoulder joint,
externally rotates the
arm at the shoulder
joint, and assists in
abduction of the arm
at the shoulder joint.

18. SUMMERY
• It is a rounded, triangular muscle.
• located on the uppermost part of the arm
and the top of the shoulder.
• It has three heads
• ANTERIOR DELTOID
• MEDIAL DELTOID
• POSTERIOR DELTOID
• All have different origin but same insertion
and different movements

20. THANK-YOU