Muscles Of Anterior Trunk And Shoulder Flashcards
What is the origin of the Pectoralis minor muscle?
Ribs 3-5
The Pectoralis minor originates from the inferior border of the ribs.
Where does the Pectoralis minor insert?
Coracoid process of the scapula
The insertion point is crucial for its functional role.
What action does the Pectoralis minor perform?
- Depresses scapula
- Downwardly rotates scapula
- Elevates rib cage
These actions contribute to movements of the shoulder and respiratory function.
Which muscle elevates the rib cage?
Pectoralis minor
This action aids in breathing by increasing thoracic volume.
What is the action of the External intercostals?
Elevates rib cage
They play a vital role in inhalation.
What is the primary action of the Diaphragm?
Increases thoracic volume for inhalation
The diaphragm is the main muscle of respiration.
Which muscle is responsible for downwardly rotating the scapula?
Pectoralis minor
This rotation is important for arm movements.
What is the origin of the internal intercostals?
Superior border of ribs
The internal intercostals originate from the upper side of each rib.
What is the insertion point of the internal intercostals?
Inferior border of ribs
The internal intercostals insert on the lower side of the rib directly below.
Which ribs do the serratus anterior attach to?
Ribs 1-8
The serratus anterior muscle originates from the first eight ribs.
What is the insertion point of the serratus anterior?
Vertebral border of the scapula
The serratus anterior inserts along the medial border of the scapula.
What action does the internal intercostals perform?
Depresses rib cage
The internal intercostals help lower the rib cage during forced expiration.
What is one action of the serratus anterior?
Rotates inferior angle of scapula laterally
This action is important for shoulder movement and stability.
What muscle is responsible for flexing the vertebral column and compressing the abdominal wall?
Rectus abdominis
The rectus abdominis is a key muscle in the abdominal wall that aids in movements such as bending forward.
What is the origin of the External oblique muscle?
Ribs 5-12
The external oblique originates from the lower ribs, contributing to its role in trunk rotation and lateral flexion.
What is the insertion point for the Internal oblique muscle?
Linea alba, Pubic crest, Pubic tubercle
The internal oblique inserts on several structures, allowing it to effectively compress the abdominal contents.
What is the primary action of the External oblique muscle?
Flexes vertebral column, Compresses abdominal wall
The external oblique plays a significant role in movements that involve bending and twisting the torso.
Fill in the blank: The Internal oblique muscle originates from the _______.
Lumbar fascia, Iliac crest, Inguinal ligament
These origins allow the internal oblique to support the abdominal cavity and assist in trunk movements.
What muscle flexes the lumbar region of the vertebral column?
Internal oblique
The internal oblique is crucial for flexing the lumbar area, which is important for posture and movement.
True or False: The Rectus abdominis muscle originates from the pubic crest.
False
The rectus abdominis originates from the pubic symphysis, not the pubic crest.
What are the actions of the Internal oblique muscle?
Flexes lumbar region of vertebral column, Rotates lumbar region of vertebral column
These actions are essential for various rotational and bending movements of the torso.
What is the insertion of the Rectus abdominis muscle?
Xiphoid process, Ribs 5-7
The insertion points allow the rectus abdominis to exert a pulling force during flexion of the trunk.
