What are the three sections of the thorax?

What are the three sections of the thorax?

The insect thorax consists of three segments (called the prothorax, mesothorax, and metathorax), which may be fused but are usually recognizable.

What is a thorax anatomy?

In vertebrates (fishes, amphibians, reptiles, birds, and mammals), the thorax is the chest, with the chest being that part of the body between the neck and the abdomen.

Why is the thorax important?

Your thorax is an important structure, the bones and ligaments protecting vital internal organs underneath. But it’s also where we get most of the rotation of our trunk. The nerves from our thorax supply the abdominal muscles; these muscles protect our lower back and abdominal organs.

Is thorax same as thoracic?

The human thorax includes the thoracic cavity and the thoracic wall. It contains organs including the heart, lungs, and thymus gland, as well as muscles and various other internal structures. Many diseases may affect the chest, and one of the most common symptoms is chest pain.

Where is angle of Louis?

The sternal angle (of Louis) is the angle between the manubrium and body of the sternum it is located 5 cm inferior to jugular notch at the level of the 2nd costal cartilage; thus, it is a useful landmark for rib counting since the first rib is difficult to feel.

What are the 4 parts of the thoracic cage?

The thoracic cage surrounds and protects the heart and lungs in the thoracic cavity. It consists of the ribs, the sternum, and the thoracic vertebrae, to which the ribs articulate. We examined the thoracic vertebrae last lab, so here we will only examine the ribs and sternum. There are twelve pairs of ribs.

What are the types of thorax?

The middle tagma, or thorax, comprises three large segments: prothorax (anterior most segment), mesothorax (middle), and metathorax (posterior) (Figure 33.3). Each segment contains chitinous plates, or sclerites, which provide support and some protection.

How many bones are in the thorax?

Chest (thorax) There are usually 25 bones in the chest but sometimes there can be additional cervical ribs in men.

How does the thorax work?

When breathing in, the intercostal muscles contract, moving the ribs up and out, increasing the volume of the thorax. When breathing out, the intercostal muscles relax, moving the ribs down and in, decreasing the volume of the thorax.

What function does the thorax perform?

The thorax consists of the thoracic spine, the rib cage, and the sternum. The thorax is a fairly rigid structure whose function is to provide a stable base for muscles to control the craniocervical region and shoulder girdle, to protect internal organs, and to create a mechanical bellows for breathing.

What organs are in the thorax?

[2] The thoracic cavity contains organs and tissues that function in the respiratory (lungs, bronchi, trachea, pleura), cardiovascular (heart, pericardium, great vessels, lymphatics), nervous (vagus nerve, sympathetic chain, phrenic nerve, recurrent laryngeal nerve), immune (thymus) and digestive (esophagus) systems.

What are the basic concepts of thorax anatomy?

Thorax 1 Thoracic wall. The first step in understanding thorax anatomy is to find out its boundaries. 2 Thoracic cavity. Now that we’ve covered the boundaries, let’s add another layer of knowledge to the initial basic thorax definition. 3 Neurovasculature. 4 Organs. 5 Female breast anatomy.

How does the thoracic cavity communicate with the neck?

The thoracic cavity communicates with the neck via the superior thoracic aperture and with the abdominal cavity via the inferior thoracic aperture through anatomical spaces piercing the diaphragm. Located inside each cavity and compartment are various organs, thoracic blood vessels, nerves, and lymph nodes:

What are the muscles from abdomen to thorax?

Muscles from abdomen to thorax •Rectus abdominus:originating from the xiphoid process & costal cartilages 5, 6, & 7 •External oblique:attached to the external surface of the lowest 8 ribs •Serratus anterior(laterally): inserting by finger-like processes into ribs 1-8 from scapula Intercostals 1. External intercostal muscle:

What is the inferior thoracic skeleton made of?

The inferior one is almost completely covered by the diaphragm, separating it from the abdominal cavity. Moving forward with the skeletal scaffold of the thorax, we have the thoracic skeleton. It is made up of the sternum, twelve pairs of ribs, twelve thoracic vertebrae, and interconnecting joints.