Facial vein (from medial canthal vein): communicates with cavernous sinus, no venous valve, dangerous triangle

Retromandibular vein: formed by the union of the superficial temporal vein and the maxillary vein in the parotid gland

External jugular vein: formed by the confluence of the mandibular angles, descends along the surface of the sternocleidomastoid muscle, and empties into the subclavian vein or venous angle.

Internal jugular vein: descends along the internal carotid artery and is located deep to the sternocleidomastoid muscle

Subclavian vein: The junction with the internal jugular vein is called the venous angle

anterior jugular vein

Cephalic vein: originates from the radial side of the dorsal venous network of the hand and empties into the axillary vein or subclavian vein

Basilic vein: originates from the ulnar side of the dorsal vein network of the hand and empties into the axillary vein or brachial vein

Median cubital vein: connects the cephalic vein and basilic vein

Brachiocephalic vein: The internal jugular vein and subclavian vein join together, and the left and right brachiocephalic veins join to form the superior vena cava.

Superior vena cava: Formed by the union of the left and right brachiocephalic veins, it descends on the right side of the ascending aorta and empties into the right atrium.

Azygos vein (right side of spine): originates from the right ascending lumbar vein, ascends along the back of the esophagus and the right side of the thoracic aorta, and empties into the superior vena cava

Accessory hemiazygos vein (upper left part of spine): empties into the azygos vein or hemiazygos vein

Hemizygos vein (lower left part of spine): originates from the left ascending lumbar vein and empties into the azygos vein

Superficial veins of lower limbs

deep veins of lower limbs

Common iliac vein: formed by the union of the external iliac vein and the internal iliac vein

External iliac vein: The popliteal vein continues behind the inguinal ligament

internal iliac vein

Inferior vena cava (injects into the right atrium): The left and right common iliac veins join together at the right front of L4 or L5, and go up along the right side of the abdominal aorta and the right front of the spine.

The hepatic portal vein system (which collects venous blood from unpaired organs in the abdominal cavity except the liver, the pelvic digestive tract, as well as the spleen, pancreas, and gallbladder) is connected to capillaries at its beginning and end