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Related Concept Videos

Muscles of the Thorax01:25

Muscles of the Thorax

The thorax muscles are central to the body's respiration and provide essential support and movement for the upper body. They are intricately designed to facilitate the complex breathing process while also contributing to the structural integrity and mobility of the chest and upper limbs.
The diaphragm is at the core of thoracic musculature, the primary muscle involved in breathing. This expansive, dome-shaped muscle marks the division between the thoracic and abdominal cavities. It originates...
Muscles of the Shoulder01:23

Muscles of the Shoulder

The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
The Thoracic Cage: Sternum01:17

The Thoracic Cage: Sternum

The thoracic or rib cage forms the body's thorax (chest) portion. Its primary function in the body is to protect vital organs in the thoracic cavity, such as the heart and the lungs. It consists of 12 pairs of ribs with their costal cartilages and the sternum. The ribs are anchored posteriorly to the 12 thoracic vertebrae (T1-T12).
The sternum is the elongated bony structure on the anterior side of the thoracic cage. It consists of three parts: the manubrium, the body, and the xiphoid process.
Muscles that Move the Head01:19

Muscles that Move the Head

The muscles that move the head are a dynamic and complex group of structures that work together to facilitate a wide range of head movements, including rotation, flexion, extension, and lateral bending.
The bilateral sternocleidomastoid, or SCM, and the suprahyoid and infrahyoid muscles are significant head flexors. The SCM muscles originate at the sternum and clavicle and attach to the mastoid process of the temporal bone. The SCM contracts bilaterally to bend the head forward, whereas...
The Thoracic Cage: Ribs01:20

The Thoracic Cage: Ribs

Ribs are curved, flattened bones forming the thoracic cavity wall with the thoracic muscles. There are 12 pairs of thoracic ribs. The posterior ends of all the ribs articulate with the T1–T12 thoracic vertebrae. In contrast,the anterior ends of most ribs attach to the sternum via their costal cartilages.
Parts of a Typical Rib
A typical rib has a head, neck, and body. The posterior end of the rib is called the head, followed by a narrow neck. The head articulates primarily with the costal facet...
Muscles of the Vertebral Column01:27

Muscles of the Vertebral Column

The back muscles that lie deep into the thoracolumbar fascia are called intrinsic or true back muscles. These muscles are divided into four layers: superficial, intermediate, deep, and deepest layers.
Superficial Layer:
The superficial layer consists primarily of the splenius muscles, which include the splenius capitis and splenius cervicis. These muscles are mainly responsible for the head and cervical spine movements, including extension, rotation, and lateral bending. The splenius capitis...

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Surgical Fixation of Sternal Fractures: Preoperative Planning and a Safe Surgical Technique Using Locked Titanium Plates and Depth Limited Drilling
15:11

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Published on: January 5, 2015

Bilateral sternalis muscles.

Ahmed F Ibrahim1, Saeed A Makarem, Hassem H Darwish

  • 1Department of Anatomy, College of Medicine, King Saud University, PO Box 2925, Riyadh 11461, Kingdom of Saudi Arabia. Tel. +966 (1) 4671307. Fax +966 (1) 4671300.

Neurosciences (Riyadh, Saudi Arabia)
|April 5, 2012
PubMed
Summary
This summary is machine-generated.

Bilateral sternalis muscles were identified during a male cadaver dissection. This finding contributes to understanding the anatomical variations and clinical significance of this muscle.

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Area of Science:

  • Anatomy
  • Morphology
  • Human Anatomy

Background:

  • The sternalis muscle is an anatomical variant of the pectoral muscles.
  • Its presence, morphology, and attachments can vary significantly.
  • Understanding its variations is crucial for accurate anatomical interpretation.

Purpose of the Study:

  • To document the occurrence of bilateral sternalis muscles.
  • To provide a detailed description of their attachments and innervations.
  • To review existing literature on sternalis muscle anatomy and clinical relevance.

Main Methods:

  • Gross anatomical dissection of the thoraco-abdominal region of a male cadaver.
  • Detailed observation and documentation of the sternalis muscles.
  • Literature review of relevant anatomical studies.

Main Results:

  • Bilateral sternalis muscles were observed.
  • Detailed descriptions of the muscles, their attachments, and innervations were recorded.
  • A comprehensive literature review was compiled.

Conclusions:

  • The study identified bilateral sternalis muscles, adding to the known anatomical variations.
  • This detailed description aids in understanding the sternalis muscle's morphology and innervation.
  • The findings underscore the importance of recognizing anatomical variants in clinical practice.