090 The Deltoideus Muscle: Origin, Insertion, and Action

Leslie Samuel discusses the deltoidea muscle, a complex intrinsic shoulder muscle. The video covers its origins, insertion, and actions. The origins are opposite to the trapezius muscle's insertion, and the muscle is divided into three parts: anterior, lateral, and posterior. Each part's contraction results in different actions: flexion, abduction, and extension. The video concludes with a review and encourages viewers to visit the website for more resources.

What is the primary focus of the video by Leslie Samuel?

• The structure of the human heart

• The complexity of the trapezius muscle

• The anatomy of the human brain

• The deltoid muscle and its functions

Which part of the scapula is the origin of the deltoid muscle?

• Medial margin of the spine

• Inferior margin of the spine

• Superior margin of the spine

• Lateral margin of the spine

Where does the deltoid muscle insert?

• On the deltoid tuberosity

• On the clavicle

• On the scapula

• On the acromion

How many regions does the deltoid muscle have?

• Three

• Four

• Two

• One

What action is caused by the contraction of the anterior portion of the deltoid muscle?

• Flexion

• Abduction

• Extension

• Rotation

Which action is performed when the lateral portion of the deltoid muscle contracts?

• Abduction

• Adduction

• Extension

• Flexion

What is the result of the posterior portion of the deltoid muscle contracting?

• Flexion

• Adduction

• Extension

• Abduction