🥇 Anatomía de la ESCÁPULA (Omóplato). ¡Fácil, Rápida y Sencilla!

Anatomy of the Scapula

Introduction to the Video

• The video is presented by Juan José Sánchez, focusing on the anatomy of the scapula, also known as the shoulder blade.

• The previous version of this video was age-restricted due to anatomical images deemed inappropriate by YouTube, prompting a re-release with modifications.

Overview of Upper Limb Anatomy

• The upper limb is divided into portions: shoulder girdle (proximal), arm (shoulder to elbow), forearm (elbow to wrist), and hand (wrist to fingertips).

• Emphasis is placed on the shoulder girdle's importance as it connects the upper limb with the torso, marking the beginning of the appendicular skeleton.

Structure of the Shoulder Girdle

• The shoulder girdle consists of two bones: anteriorly, the clavicle; posteriorly, the scapula.

• In an anatomical position, the scapula rests against ribs 2 through 7 and has a flattened triangular shape.

Articulations and Joints

• The scapula articulates with two bones:

• Head of humerus at glenohumeral joint (shoulder joint).

• Acromion part of scapula with external third of clavicle at acromioclavicular joint.

• Some literature mentions a "thoracic-scapular joint," referring to contact between anterior face of scapula and rib cage but clarifies it's not a true joint.

Anatomical Features of Scapula

• Two main faces are described: anterior face and posterior face, separated by edges.

• Three edges identified:

• Upper edge,

• Medial edge (also called spinal edge),

• Lateral edge (also called axillary edge).

Angles and Notable Structures

• Angles formed where edges meet:

• Upper angle at junction of upper and medial edges,

• Lower angle at junction of medial and lateral edges,

• External angle marked by union of upper and lateral edges.

• A thickening referred to as "head" occurs in this external angle area.

Conclusion & Call to Action

• Viewers are encouraged to subscribe for more anatomical videos; this is video number 36 out of over 300 available on his channel.

Understanding the Scapula Anatomy

Anterior Face of the Scapula

• The anterior face is described as a concave surface, making it easier to study from the front view. However, its concavity becomes more apparent when viewed from the side.

• This area contains a significant region known as the subscapular fossa, where the subscapular muscle is inserted.

Posterior Face of the Scapula

• The posterior face presents more complexity due to structures like the spine of the scapula, which runs obliquely and separates two large areas: supraspinatus fossa above and infraspinatus fossa below.

• The spine has two distinct parts referred to as lips: an upper lip (upper jaw) and a lower lip (lower jaw). It remains attached but can appear to float at times.

Acromion and Spinoglenoid Notch

• When the spine begins to separate from the scapula, it forms what is known as the acromion, which articulates with the external third of the clavicle. This structure creates a bridge-like formation over a space called spinoglenoid notch that connects both fossae.

• The spinoglenoid notch allows for communication between supraspinous and infraspinatus fossae through this tunnel-like space created by acromion's separation from scapula.

Coracoid Process and Glenohumeral Joint

• Atop the upper edge of scapula lies a coracoid notch adjacent to a hook-shaped coracoid process; both are critical for muscle attachment points. The neck of scapula narrows outwards leading into its head, which articulates with humerus at glenohumeral joint within glenoid cavity.

• Two important tubercles are identified near this area: supraglenoid tubercle above glenoid cavity and infraglenoid tubercle below it; these serve as origins for biceps and triceps brachii muscles respectively.

Summary of Key Structures

• A lateral view distinguishes anterior concavity (subscapular fossa) from posterior features including acromion and spinoglenoid notch connecting both fossae while highlighting overall anatomy relevant for understanding shoulder mechanics.