2023年10月2日 · Originating on either side of your pelvis and lower back, the iliopsoas is composed of two muscles: the psoas major and ilacus. They help to flex and stabilize your hip and lower back as you...

The lower back comprises the lumbar spine, which is formed by vertebral bones, intervertebral discs, nerves, muscles, ligaments, and blood vessels. The spinal cord ends at the top of the lumbar spine, and the remaining nerve roots, called the cauda equina, descend down the remainder of the spinal canal.

2025年2月26日 · The lumbar region of the spine, more commonly known as the lower back, consists of five vertebrae labeled L1 through L5. The lumbar region is situated between the thoracic, or chest, region of the spine, and the sacrum. The lumbar spine typically has a slight inward curve known as lordosis.

The T12-L1 spinal motion segment, also called the thoracolumbar junction, connects the thoracic spine (upper back) with the lumbar spine (lower back). It is located in the mid-back area and aligns with the level of the last rib.

2022年5月24日 · These are the largest among all the vertebrae found in the spine. They are located in the lower back, starting from the 12th thoracic spine and extending to the sacrum. Supporting Body’s Weight: The lumbar vertebrae support the upper two parts of the vertebral column — the cervical and thoracic vertebrae — and the head.

l11和l12分别是两个开关的接线端子，l21是两个开关的公共接线端子。 接线方法：将电源线的火线接到L11和L21，将灯具的火线接到L12和L21，零线直接接到灯具的零线。

Study with Quizlet and memorize flashcards containing terms like spinal accessory nerve (CN XI), superficial branch of the transverse cervical artery, elevate, retract, and depress the scapula (upward rotation) and more.

l1是第一盏灯控制火线，l11、l12是控制回路线，l2是第二盏灯控制火线，l21、l22是控制回路线。 控制方法：把两个 单刀双掷开关 的两个触点分别相连，即开关1的触点1与开关2的触点1相连，开关1的触点2与开关2的触点2相连，然后两个开关的刀做为整个开关的两端 ...

这是 双控开关 的中间火线端，L11与L12是开关的控制端。 拓展资料： 双控开关就是一个开关同时带常开、常闭两个触点（即为一对）。 通常用两个双控开关控制一个灯或其它电器，意思就是可以有两个开关来控制灯具等电器的开关，比如，在楼下时打开开关，到楼上后关闭开关。 如果是采取传统的开关的话，想要把灯关上，就要跑下楼去关，采用双控开关，就可以避免这个麻烦。 另外双控开关还用于控制应急照明回路需要强制点燃的灯具，双控开关中的两端接双电源，一端接灯 …

2024年8月3日 · 3. but he always borrows money from his friends and never pays it back. 1)borrow sth from sb 向某人借东西. lend sb sth / lend sth to sb 把东西借给某人. pay 支付、偿还等，常出现的搭配有. pay sth back 归还… pay sb. back 向某人报复. pay sb. 或pay for sb./sth. 付款、付钱. You must pay me what you owe